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EMERSON PACSystems VersaMax MICRO PLC & NANO PLC. USER MANUAL (2019) - page 17

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13.2.3

RTD Module Input Specifications

Compatible

High Accuracy

RTD Input Channels

4, differential

Input Sensor Types

2- and 3-wire types, PT 100

Input ranges

-100.0 to +600.0°C
-150.0 to +1050.0°F

-100.0 to +600.0°C
-148 to +1112.0°F

Input Resolution

0.2°C / 0.3°F

0.1°C / 0.1°F

Accuracy

±0.5% of full scale over operating temperature range

Data Format

0 to 32000 for °F, or 0 to 28000 for °C

Constant Current

Approximately 1mA

Channel Update Time

141/563ms (selectable) for all channels

Diagnostics

LED on module blinks when input
values at

–

100°C (-150°F) or less,

or 600°C (+1050°F) or more
(includes cable disconnection)
Also, the channel input data will
contain 7FF8H

LED on module blinks when input
values at

–

110°C (-166°F) or less,

or 610°C (+1130°F) or more
(includes cable disconnection)
Also, the channel input data will
contain 7FFFH

Digital Resolution

15 bits + sign

Open Circuit Detection Time 141ms or 563ms, excluding logic execution

Channel to Channel Isolation None

Maximum Lead Resistance

100Ω

Converter Type

Successive approximation

Excitation

Current Source 1.0mA

13.2.4

RTD Module Output Specifications

Only modules IC200UEX 726 and UEX736 have outputs.

Analog Output Channels

2, single-ended, non-isolated

Output ranges

0 to 10V (10.23V maximum)
0 to 20mA (20.47mA maximum)
4 to 20mA (20.47mA maximum)

Resolution

12 bits

Accuracy

±1% of full scale over operating temperature range

Current: maximum terminal voltage

user load range

output load capacitance

output load inductance

10V (at 20mA output)

10 to 500 Ω

2000 pF maximum
1 Henry maximum

Voltage: output loading

output load capacitance

10 kΩ minimu

m at 10 volts

1 µF maximum

Response Time

8.8ms

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13.2.5

Scaling

Scaling for RTD Inputs

An RTD Expansion Unit (in the Compatible mode) processes input channels with a 12-bit
successive-approximation A/D converter. It converts the input value into a digital count,
calculates the %AI value as described below, then places the result into the appropriate %AI
input reference (these references are described in Chapter 22:).

Figure 99

The table below lists equivalent decimal and hexadecimal conversion values for Celsius and
Fahrenheit inputs.

Input Signal

A/D Converter Value

Gain Factor

%AI Range

Celsius Mode (-100°C to 600°C) 0

–

3500 counts

0 - 28000

Fahrenheit Mode (-150 F to
1050°F)

–

4000 counts

0 - 32000

Scaling for Analog Outputs

To generate the analog output signal, the RTD Expansion Unit converts the value in the %AQ
output reference into a count value for the 12-bit D/A converter, which then drives the
analog output.

Figure 100

Automatic Gain and Offset Adjustment for Analog Outputs

If DIP switch 6 is in the ON position (default) the D/A Converter’s output range is 4,000

counts. If this DIP switch is set to the OFF position, the output range is 4,096 counts.

The application's %AQ output range of 0 to 32000 corresponds to the D/A converter's
output count range. The Expansion Unit first multiplies the %AQ value from the program by
(output range / 32000) to produce the count value for the D/A Converter:

Compatible resolution mode: (%AQ ×

32000

4000

) = (%AQ × 0.125) = D/A count

Maximum resolution mode: (%AQ ×

32000

4096

) = (%AQ ×X 0.128) = D/A count

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Any calculated value that exceeds 4095 (2

-1) is clamped at that maximum value. Any

calculated value less than 0 is clamped at 0. The range 0 to 4095 corresponds to %AQ values
between 0 and 32,760.

Automatic Conversion of Counts to Analog Voltage or Current

In voltage mode, the D/A Converter converts the count value in the range of
0

–

4,000 or 0

–

4,096 counts to an analog signal from 0 to 10,000mV. The output voltage

gain (ratio) for this conversion is 2.5.

In compatible resolution mode (D/A Converter range is 0

–

4,000), loading a count value of

32760 results in an analog output value of 10.23V.

In maximum resolution mode (D/A Converter range is 0

–

4,096), loading a count value of

32760 results in an analog output value of 10.00V

In current mode, the D/A converter converts the count value to an analog signal from 0 to
20,000µA. The output current gain for this conversion is 5. The conversion for both current
modes (0-20mA and 4-20mA) is the same.

Range

0000

2000 H07D0

4000 H0FA0

4095 H0FFF

0-10V

10V

10.23V

0-20mA

0mA

10mA

20mA

20.47mA

4-20mA

4mA

12mA

20mA

20.38mA

13.2.6

Wiring for RTD Expansion Modules

Figure 101

On modules IC200UEX726 and UEX736, voltage and current outputs are present on their
respective output terminals at the same time. For proper module operation, only the
output terminals that correspond to the voltage / current output configuration should be
connected.

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13.3

Module Installation

To avoid risk of electric shock, turn off power to the Micro PLC and disconnect the
main power before connecting the RTD expansion modules.

Loosen the screws on the terminal block and attach unit power, RTD wires and
analog outputs. Tighten all screws securely. The RTD wires should be the same type
and length (except for the jumper used in a two-wire RTD) to ensure accuracy. Do
not use the shield or drain wire for the third connection.

If all RTD

channels are not used, a 100 to 300 Ω resistor can be connected across

terminal A to B with a jumper connected from B to b. The resistor will disable the
diagnostics and stop the channel LED from flashing.

Connect the expansion cable to the Micro PLC or expansion unit to the left of the
RTD Expansion Unit.

Turn power on. Check the LEDs as shown on the next page. The Power and OK LEDs
should be ON. The LEDs for channels 1 to 4 should be OFF during normal operation
if the RTDs are connected properly.

13.3.1

DIP Switches

The default DIP switch settings for the RTD units are switches 1-5 and 7-8 OFF and switch 6
ON.

For RTD expansion units, DIP switch 2 selects the RTD channels update rate. In the factory
default OFF position, switch 2 selects a 562ms update rate. The update rate can be changed
to 141ms by moving switch 2 to the ON position.

From Release 4.0 and above, DIP Switch 3 can be used to select between Compatible
(Switch 3 OFF) and High Accuracy (Switch 3 ON) modes. In the PME configuration of RTD

module, selection for “Conversion mode” parameter should match this DIP switch

selection.

Default DIP Switch Settings for RTD Expansion Module

Figure 102

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Note:

•

Do NOT change the settings of any of the other DIP switches.

•

The module must be powered OFF before changing the DIP switch settings.

13.3.2

LED Indications

The module’s LEDs indicate the status of the module and of the RTD inputs.

RTD1

RTD2

RTD3

RTD4

POW

If an initialization error occurs, the OK LED blinks rapidly.

During normal operation, the RTD input LEDs should be off. If an RTD input is outside the
range of -100°C (-150°F) to +600°C (1050°F), its LED blinks.

13.3.3

Data Conversion for RTD Expansion Units (in Compatible
mode)

Individual channels on an RTD Expansion Units can be individually configured for either
Celsius or Fahrenheit

If Celsius is configured, the range of data for a channel is 0 to 28,000.

If Fahrenheit is configured, the range of data for the channel is 0 to 32,000.

•

Values below 0 indicate shorted cable.

•

Values above 28,000 (when configured for Celsius) or 32,000 (when configured for
Fahrenheit) indicate disconnected (open) or shorted cable.

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Basic Temperature Conversion Logic

Figure 103

The Scaling function (see Chapter 23:) can be use in the application program to convert the
raw counts value for a channel to a temperature measurement in degrees. The ranges are
100 to +600 degrees C and 150 to +1050 degrees F. The example logic shown here applies
to Compatible mode only.

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High-Resolution Temperature Conversion Logic for RTD
Units

For accuracy in tenths of degrees, the Data Type Conversion functions (see Chapter 23:)
can be added to the program logic. See the examples (for the Compatible mode) below.

Figure 104

Celsius Conversion

Line 15: Converts RTD to Real Value. Data will be stored in two consecutive Registers 100
and 101

Line 16: Divides the raw value by 40.0 (28000/700) 700 comes from the full temperature
range of 600 to

–

100 C. Result is placed in R102 and R103

Line 17: Subtracts 100 for conversion. This is to offset the

–

100 and the result is in R104 and

R105

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Fahrenheit Conversion

Line 18: Converts RTD to Real Value. Data will be stored in two consecutive Registers 110
and 111

Line 19: Divides the raw value by 26.66667 (32,000/1200) 1200 comes from the full
temperature range of 1050 to

–

150 F. Result is placed in R112 and R113

Line 20: Subtracts 150 for conversion. This is to offset the

–

150 and the result is in R114 and

R115

13.4

Thermocouple Expansion Modules

VersaMax Micro PLC Thermocouple Expansion modules are used for applications such as
food and beverage production, process control, and environmental control. The following
types of Thermocouple expansion module are available:

•

IC200UEX824 4 Thermocouple Inputs, 24Vdc Power Supply

•

IC200UEX826 4 Thermocouple Inputs and 2 Analog Outputs, 24Vdc Power Supply

One VersaMax Micro PLC can monitor up to sixteen thermocouples (four thermocouples per
expansion module, four expansion modules per Micro PLC).

Note:

•

Thermocouple Expansion modules support DOIO for inputs and outputs.

•

If a Thermocouple Expansion module is auto configured with DIP switch 6 OFF (Compatibility
Mode), it reports its identity as a standard analog expansion module (IC200UEX616/626/636).
This has no effect on module operation.

•

For Micro release 4.0 and later, if the Thermocouple Expansion module is auto-configured with
DIP switch 6 ON (High-Accuracy Mode), it reports as IC200UEX826.

13.4.1

Compatibility

Thermocouple Expansion modules are compatible with:

•

VersaMax Micro-20, -40, and -60 CPUs version 3.81 or later.

•

VersaMax Micro-23 and

–

28 CPUs version 3.55 or later.

•

VersaMax Micro-14 CPUs version 3.56 or later.

They are configurable using Logic Developer 5.70 and above. Some compatible software
versions do not list these modules separately but allow them to be configured as RTD
expansion units, as described later in this section.

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13.4.2

Thermocouple Module General Specifications

Module Dimensions

Height: 90mm (3.6 inches)
Depth: 76mm (3.0 inches)
Width: 150mm (6.0 inches)

Inputs

4 Thermocouple inputs

Outputs

Model IC200UEX826 only: 2 analog outputs

Power voltage

24Vdc

Range

19.2Vdc to 30Vdc

Inrush Current/Time

2.5A / 1ms at 30V

Input Current

0.1A at 30V

Input Power Supply Rating

Allowable momentary power failure

10ms

Operating ambient temperature

0°C to 55°C (Storage ambient temperature

–

10°C to 75°C)

Operating ambient humidity

5 to 95 % RH (no condensation)
(Storage ambient humidity 5 to 95 % RH (no condensation))

Vibration resistance

Complies with JIS C 0911

Noise resistance

Noise voltage 1500 Vpp Noise pulse width 100 ns, 1 µs
Static noise: 3000 V at metal exposed area

Insulation resistance

20 M



or more between the AC external terminal and case

ground (PE) terminal

Dielectric withstand voltage

500V DC

Grounding

Class D (100



) independent grounding

Usage environment

No corrosive gases, no excessive dirt

Structure

Attaches to an open panel

Cooling

Natural air cooling

Protection against electrical shock
hazard

Class 1 equipment

Open equipment

13.4.3

Analog Output Specifications (Model IC200UEX826)

Analog Output Channels

2, single

Output Ranges

0-10 V (10.24 V maximum), 0-20 mA (20.48 mA maximum)

Resolution

0-10 V, 12 bits, 0-20 mA, 12 bits

Accuracy

±1% of full scale over temperature range

Current Outputs

Max. Voltage at

20 mA: 10 V

User Load Range: 10 to 500



Output Load Capacitance: 2000 pF Maximum
Output Load Inductance: 1 Henry Maximum

Voltage Outputs

Output Loading:

10 k



Minimum at 10 V

Output Load Inductance: 1 µF Maximum

Response time

8.8 ms

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13.4.4

Thermocouple Module Input Specifications

Input Channels

4, differential

Sensor type

Following JIS C 1602-1995
Type K, J, E, S, T, B, N, -/+50mV, -/+100mV

Temperature
range and
accuracy
(±%) at 0 to
55°C

Type

Accuracy range

Input range

-200 to 1200°C (-328 to 2192F)
0.4%(FS)

-270 to 1370°C (-454 to
2498°F)

-40 to 750°C ( -40 to 1382°F)
0.3%(FS)

-210 to 1200°C (-316 to
2192°F)

-200 to 900°C (-328 to 1652°F)
0.3%(FS)

-270 to 1000°C (-454 to
1832°F)

0 to 1600°C ( 32 to 2912°F) 1.0%(FS)

-50 to 1760°C (-58 to
3200°F)

-200 to 350C (-328 to 662F)
0.8%(FS)

-270 to 400°C (-454 to
752°F)

600 to 1700°C (1112 to 3092°F)
1.0%(FS)

0 to 1820°C (32 to 3308°F)

-200 to 1200°C (-328 to 2192°F)
0.4%(FS)

-270 to 1300°C (-454 to
2372°F)

±50mV

-50 to 50mV 0.5%(FS)

-50 to 50mV

±100mV -100 to 100mV 0.5%(FS)

-100 to 100mV

TC mode

High Accuracy Mode

Compatible Mode

Resolution

K,J,E,T,N 0.1°C/0.2°F

0.5C/1°F

B,S

1.0°C/1.0°F

1.0°C/1°F

±50mV

0.01mV

0.025mV

±100mV 0.02mV

0.05mV

Units of data output

0.1°C/0.1°F
0.01mV

0.5°C/1°F
0.025mV, 0.05mV

Conversion data

15 bits + sign

Cold junction
compensation accuracy

Less than ±2°C (ambient temperature is 0 to 55°C)

Cold junction input range

-20°C to 80°C

Diagnostics (Broken
Wire/Under or Over range
reporting)

LED indication (per channel)
Channel input data is 7FFF
hexadecimal

LED indication (per channel)
Channel input data is 7FF8
hexadecimal

Conversi
on time

K, J, E, T, N,
B, S

563ms (4ch. total)

±50, 100mV

141ms (4ch. total)

Accuracy Range represents measurements within which operation of the module is guaranteed.

The Input Range represents an extended range for which operation cannot always be guaranteed.

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13.4.5

Scaling for Thermocouple Module Data

Scaling for Inputs

A Thermocouple Expansion Unit (in the Compatibility mode) processes input channels with
a 12-bit successive-approximation A/D converter. It converts the input value into a digital
count, calculates the %AI value as described below, then places the result into the
appropriate %AI input reference (these references are described in Chapter 22:).

Figure 105

The table below lists equivalent decimal and hexadecimal conversion values for Celsius and
Fahrenheit inputs.

Input Signal

A/D Converter Counts Value

Gain Factor %AI Range

Celsius mode (-249.5°C to
1760°C)

–

4020 counts

8 - 32160

Fahrenheit mode (-499°F to
3308°F)

–

3808 counts

8 - 30464

Voltage mode (±50mV)

–

4048 counts

384

–

32384

Voltage mode (±100mV)

–

4048 counts

384 - 32384

13.4.6

Scaling for Analog Outputs (Model IC200UEX826)

To generate the analog output signal, the Thermocouple Expansion Unit converts the value
in the %AQ output reference into a count value for the 12-bit D/A converter, which then
drives the analog output.

Figure 106

Automatic Gain and Offset Adjustment for Analog Outputs

The application's %AQ output range of 0 to 32000 corresponds to the D/A converter's
output count range of 0 to 4000. The Expansion Unit first multiplies the %AQ value from the
program by 0.125 (=4000/32000) to produce the count value for the D/A converter:

(%AQ X 0.125) = D/A count

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Any calculated value that exceeds 4095 (212-1) is clamped at that maximum value. Any
calculated value less than 0 is clamped at 0. The range 0 to 4095 corresponds to %AQ values
between 0 and 32,760.

Automatic Conversion of Counts to Analog Voltage or Current

In voltage mode, the D/A converter then converts the count value in the range of 0 to 4,000
counts to an analog signal from 0 to 10,000mV. The output voltage gain (ratio) for this
conversion is 2.5.

In current mode, the D/A converter converts the count value to an analog signal from 0 to
20,000µA. The output current gain for this conversion is 5.

Range

0000

2000
H07D0

4000
H0FA0

4095
H0FFF

0-10V

10V

10.24V

0-20mA

0mA

10mA

20mA

20.48mA

13.4.7

Thermocouple Module Configuration

Micro  PLC  firmware  versions  4.0  and  above  provide  complete  support  to  Thermocouple
modules  including  the  High-Accuracy  mode.  Also  PME  versions  6.0  SIM1  and  above
completely  support  the  Thermocouple  modules  (i.e.  no  workaround  with  RTD  modules
needed for thermocouple configuration). Each channel of a Thermocouple Expansion Unit
can be individually configured for Sensor selection, Mode (Celsius or Fahrenheit) and Cold
Junction Compensation (Enable or Disable)

The following description of this section is applicable only for CPU and PME versions prior to
that of the above mentioned.

With Logic Developer (PME) 5.70 and above, Thermocouple module can easily be
configured by selecting the corresponding RTD module in the Module window.

Thermocouple Module

Corresponding RTD Module

IC200UEX824

IC200UEX724

IC200UEX826

IC200UEX726

The Input Channel Mode for each of the Thermocouple channels can be configured as
Celsius or Fahrenheit.

For IC200UEX826, the Output Channel Mode parameter can be used to configure the
Voltage/Current values of a Thermocouple module.

•

If the selection is Voltage, the Output Channel Range is not available.

•

If the selection is Current, the Output Channel Range MUST be 0 to 20 mA.

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Figure 107

Also, for versions earlier than 4.0, the Cold Junction Compensation is always enabled by
default and cannot be disabled either through PME or through DIP switch settings.

13.4.8

Wiring for Thermocouple Expansion Modules

Figure 108

On module IC200UEX826, voltage and current outputs are present on their respective
output terminals at the same time. For proper module operation, only the output terminals
that correspond to the voltage / current output configuration should be connected.

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13.5

Module Installation

To avoid risk of electric shock, turn off power to the Micro PLC and disconnect the
main power before connecting Thermocouple expansion modules.

Connect the expansion cable to the Micro PLC or expansion unit to the left of the
Thermocouple Expansion Unit.

Check the DIP switch settings as shown on the next page.

Turn power on. Check the LEDs as shown on the next page. The Power and OK LEDs
should be ON. The LEDs for channels 1 to 4 should be OFF during normal operation
if the thermocouple inputs are connected properly.

Connect the Cold Junction sensor. If that is not done, all four module LEDs flash
continuously.

13.5.1

DIP Switch Settings

Micro PLC firmware versions 4.0 and above provide complete support to Thermocouple
modules including the High-Accuracy mode. DIP Switch 6 can be used to select between
Compatible (Switch6 OFF) and High Accuracy (Switch 6 ON) modes. In the PME
configuration

of Thermocouple module, selection for “Conversion mode” parameter

should match  this  DIP switch selection. As PME versions 6.0  SIM1  and  above completely
support  the  Thermocouple  modules,  (when  the  Micro  PLC  firmware  version  is  4.0  and
above) Sensor/ mV selection should be done using PME instead of through DIP Switches as
PME  settings  always  override  the  DIP  switch  settings.  Hence  the  following  description
applies only to the CPU and PME versions prior to that of the above mentioned.

The sensor selection for all input channels can be configured ONLY using DIP switches 1 to
3, it cannot be done using Logic Developer. If DIP switches 1-3 are set for mV selection (all
On), the settings take precedence over the Logic Developer configuration of Input Channel
Mode and Range. The module must be powered OFF before changing the DIP switch
settings.

Switch

Default

Function

off

Input Sensor
selection (Ch1-4)

off on

off

on off

off

off off

on off

off

off off

off

off on

off

mV selection
(Valid when DIP
Switches 1,2,3
are all On.)

Off => 50mV

On => 100mV

Do NOT change settings of any of the other DIP switches. The default setting for all other
DIP switches is Off.

For Thermocouple units, setting switch 6 to On causes a System Configuration Mismatch
fault in the PLC Fault Table. For these modules, auto-configuration with specified switch On
will flash error code 12-

2 on the CPU’s OK LED. If this error occurs, the CPU OK LED will

repeatedly follow the sequence:

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•

Blink 12 times

•

Go Off (short)

•

Blink 2 times

•

Go Off (long pause)

To restore normal functionality, turn off power to the PLC and expansion units and set the
DIP switch to Off. Turn On power to the PLC and expansion units again.

13.5.2

LED Indications

The

module’s LEDs indicate the status of the module and the inputs.

TC1 TC2 TC3 TC4

POW

If an initialization error occurs, the OK LED blinks rapidly.

If an input signal is out of range or the cable is disconnected, its corresponding LED
blinks every 1 second with almost equal On and Off time. In addition, in this case the
channel input data contains the value 7FF8 (7FFF in High Accuracy mode).

If cold junction signal is out of range or the cable is disconnected, all four LEDs blink
simultaneously every 1 second with a short on time and longer Off time.

During normal operation, the thermocouple input LEDs should be Off. If any of the four LEDs
is On, it indicates a communication error with the PLC CPU.

If multiple errors occur, input signal errors (2 above) have priority over cold junction signal
errors (3 above). For example:

Input signal for channel 2 is out of range, for channel 3 cable is disconnected and the cold
junction compensation signal is out of range. In this case, LEDs 2 and 3 blink with almost
equal On and Off time. LEDs 1 and 4 blink with shorter On time and longer Off time.

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13.5.3

Basic Temperature Conversion Logic

The Scaling function (see Chapter 23:) can be use in the application program to convert the
raw counts value for a channel to a temperature measurement in degrees. The example
logic shown here applies to Compatible mode only.

Figure 109

Figure 110

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