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13.5.4

High-Resolution Temperature Conversion Logic for
Thermocouple 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 111

Celsius Conversion

Line 6: Converts thermocouple input to Real Value. Data will be stored in two consecutive
Registers 100 and 101

Line 7: Divides the raw value by 16.0 ((32160-8)/ 2009.5).

The value 2009.5 comes from the full temperature range of 1760 to

–

249.5 C. Result is

placed in R102 and R103

Line 8: Subtracts 250 for conversion. This is to offset the

–

250 and the result is in R104 and

R105

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Figure 112

Fahrenheit Conversion

Line 10: Converts thermocouple input to Real Value. Data will be stored in two consecutive
Registers 200 and 201

Line 11: Divides the raw value by 8 ((30464-8)/ (3807))

The value 3807 comes from the full temperature range of 3308 to

–

449 F. Result is placed

in R202 and R203

Line 12: Subtracts 500 for conversion. This is to offset the

–

500 and the result is in R204 and

R205

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Chapter 14:

CPU Option Modules

This chapter describes option modules for 20, 40 and 64-Point VersaMax Micro PLCs.

IC200UMB001

Memory Pack Module

IC200USB001

RS232, Extra Port Option Module

IC200USB002

RS485, Extra Port Option Module

IC200UUB001

USB/RS232 Conversion Option Module

IC200UEM001

10/100 Mbit Ethernet Communications Module

14.1

Using Option Modules

Option Modules can be used to enhance the functionality of a 20-, 40-, or 64-Point VersaMax
Micro PLC. These option modules install in the front of the Micro PLC. One Port module
(UEM001, USB001, USB002, or UUB001), and/or a Memory Pack module (UMB001) can be
installed.

Option modules, except the Memory Pack Module, are configured using the Machine
Edition software. The Memory Pack Module does not require software configuration. If the
configuration and installed option modules are different, the PLC logs a fault in the Fault
Table (System Configuration Mismatch).

Note:

If the configured module is RS232/USB and the physically connected module is Ethernet
communication module (upon downloading configuration), a system configuration mismatch
fault will not be logged. The converse is also true.

14.2

IC200UMB001
Memory Pack Module

The VersaMax Micro PLC Memory Pack Module, IC200UMB001, can be used to store and
update the configuration, application program, and reference table data of a 20, 40, or 64-
Point Micro PLC.

Figure 113

The Memory Pack Module plugs directly into port 2 on the Micro PLC. Power for the device
comes from port 2.

A programmer and PLC CPU are used to initially write data to the Memory Pack Module. In
addition to writing data to the Memory Pack, the programmer can read data already stored
on the Memory Pack and can compare that data with files already present in the
programmer.

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After the data is stored on the Memory Pack, the data can be copied to one or more other
PLC CPUs of the same type, with no programmer needed. To do that, the Memory Pack
Module is removed from the Micro PLC, and installed on another Micro PLC (Micro PLCs must
be powered down to remove or install an option module). When the second Micro PLC is
powered up, all of the data on the Memory Pack is written into the corresponding PLC
reference addresses.

14.2.1

Features

•

Store 128kB of data.

•

Read the data at Power up.

•

Read/Write/Verify the data through programmer command.

With  the  programmer  present,  the  PLC  CPU  can  read,  write,  or  verify  a  program,
configuration and tables in the Memory Pack Module. When reading or verifying data, it is
possible  to  select  hardware  configuration,  logic,  and/or  reference  tables  data.  However,
when  writing  data  to  the  Memory  Pack  Module,  all  the  data  (logic,  configuration  and
reference tables) must be written. Individual data types cannot be selected for writing.

Reading Data from the Memory Pack Module at Startup

If the Memory Pack Module is connected to the port 2 when the PLC is switched on, the PLC
automatically reads all the data (program, configuration, and tables) in the Memory Pack
Module. The Micro PLC stores the data in its RAM/FLASH and flash based on the options that
have been set in the hardware configuration.

The OK LED keeps blinking while the data is being transferred from the Memory Pack
Module to the PLC. Wait until the OK LED stops blinking to do any further operations.

Data Read, Write, Verify Operations Using the Programming
Software

Read/Write/Verify operations can be done on the Memory Pack Module using the
programming software. The PLC must be placed in Stop mode.

The path for write /read/ verify through programming software is:

Targets -> online commands -> Flash/EEPROM

The popup window for write/read/verify appears. Select the memory storage board option
from the two choices (memory storage board or flash memory) to transfer data between
the Memory Pack module and the CPU. Then select the write/read/verify operation. The
programming software shows the status of the data transfer.

The Memory Pack Module and PLC must both have either no OEM key password or the same
OEM key password for the data to be transferred. The Memory Pack Module does not
perform special processing for other type of passwords.

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Write Protect Switch

Figure 114

The Write Protect switch on the Memory Pack Module prevents writing data to the module
when it is in the ON position.

CAUTION

If the Write Protect switch is in ON position and the programming software tries to write
data to the Memory Pack Module, the data is NOT written to the module. However, no error
message is generated, and there is no indication that the data has not been written. This
should be considered before setting the Write Protect switch.

14.3

IC200USB001
RS232 Extra Port Option Module with 2 Analog
Inputs

VersaMax Micro PLC Option Module IC200USB001 can be used with a 20, 40, or 64-Point
Micro PLC to provide an extra RS232 Port and two analog inputs.

Figure 115

When installed on the Micro PLC, the RS232 Port Option Module becomes port 2. It supports
the following communications protocols:

•

Modbus Master/Slave

•

Serial Read/Write

•

SNP/SNPX Master/Slave

Use of the Port Option module as port 2, and the protocol selection must be set up in the
configuration software. After making those selections, the communications parameters
can also be configured.

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Pin assignments for Port 2 are

Figure 116

An external device can obtain power from the 5Vdc output pin if it requires 200mA or less
at 5Vdc.

14.3.1

Analog Inputs

The terminals on the Port Option Module can be used for analog inputs with the following
characteristics:

Input Ranges

0-10 V (10.24 V Max)

Resolution

0-10 V, 10 bits

Accuracy

±1%

Linearity

±3 LSB Maximum

Voltage Input Impedance

100kΩ

Isolation

Channel to channel: none
CPU to analog signal: none

Analog Terminal Wiring

Solid wire: 0.14mm2 to 1.5mm2
Stranded wire: 0.14mm2 to 0.10mm2

Figure 117

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14.4

IC200USB002
RS-422/485 Extra Port Option Module with 2
Analog Inputs

VersaMax Micro PLC Option Module IC200USB002 can be used with a 20, 40, or 64-Point
Micro PLC to provide an extra RS-422/485 Port and two analog inputs.

Figure 118

When installed on the Micro PLC, the RS-422/485 Port Option Module becomes port 2. It
supports the following communications protocols:

•

Modbus Master/Slave

•

Serial Read/Write

•

SNP/SNPX Master/Slave

Use of the Port Option module as port 2, and the protocol selection must be set up in the
configuration software. After making those selections, the communications parameters
can also be configured.

Pin assignments for Port 2 are:

Figure 119

An external device can obtain power from the 5Vdc output pin if it requires 200mA or less
at 5Vdc.

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14.4.1

Analog Inputs

The terminals on the Port Option Module can be used for analog inputs with the following
characteristics:

Input Ranges

0-10 V (10.24 V maximum

Resolution

0-10 V, 10 bits

Accuracy

±1%

Linearity

±3 LSB Maximum

Voltage Input Impedance

100kΩ

Isolation

Channel to channel: none
CPU to analog signal: none

Analog Terminal Wiring

Solid wire: 0.14mm2 to 1.5mm2
Stranded wire: 0.14mm2 to 0.10mm2

Figure 120

14.5

IC200UUB001
USB / RS232 Conversion Option Module

VersaMax Micro PLC Option Module IC200UUB001 can be used with a 20, 40, or 64-Point
Micro PLC to provide a USB Port.

Figure 121

Characteristics of the USB Port are:

Connector

Straight B type

USB version

2.0

Power

Self-powered

Baud Rates
Supported

4800 through 38400 only.
Do not configure other baud rates for Port 2 when using the USB Conversion
Option Module.

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Connecting to the USB board from windows should automatically download the correct
driver from Microsoft. To download directly, go to

http://www.ftdichip.com/Drivers/FT232-

FT245Drivers.htm

14.6

IC200UEM001
RJ-45, 10/100 Mbit Ethernet Communications
Module

The VersaMax Micro PLC Option Module IC200UEM001 can be used with a Micro 20, 40, or
64-Point PLC to provide an Ethernet Port.

Figure 122

When installed on the PLC, the Ethernet Port Option Module becomes Port 2. It supports the
following communications protocols:

•

SRTP Server

•

Modbus Server/Client (separate download)

•

Pass- through port (separate download).

Protocol options are available on

https://www.emerson.com/Industrial-Automation-

Controls/support

14.6.1

Module Specifications

Processor Speed

DSTni-EX CPU, 48MHz

Memory

256 kByte RAM, 512 kByte FLASH

Connection Type

RJ 45 10Base-T/100Base-TX Ethernet

Entity Type

Server/Client

Bus Speed

10/100Mbaud

Number of Connections
Supported

Supports up to 8 TCP/IP connections (4 for SRTP, 8 for Modbus
TCP, 1 for Tunneling)

Mode

Full Duplex

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14.6.2

Status LEDs

Link LED (Amber)

Solid Amber: Connection to Micro 64 established and network is connected

Activity (Green)

Flashing Green when there is any activity on the network

Status (Red)

OFF: No errors
Red ON: Duplicate IP address present or network controller error
Red BLINK (2x/sec): No DHCP response or Setup menu active

14.6.3

Configuration Options

The option port should be configured for Ethernet. Configuration options are:

Protocol

Parameters

Value

SRTP Server

Port Mode

SNP

Port Type

Slave

Data Rate

19.2, 38.4 or 175.0 kbps (default)

Flow Control

None

Parity

Odd (default), Even, None

Stop bits

1 (default), 2

Time Out

Long

Turnaround Time

Modbus TCP Client/Server

Port Mode

RTU

Port Type

Slave

Data Rate

19.2, 38.4 or 175.0 kbps (default)

Flow Control

None

Parity

Odd (default), Even, None

Station Address

–

247. Default = 1.

Modbus/TCP Client
Support (see page 252).

Disabled (default) or Enabled.
Enabling Modbus/TCP Client Support
sets the %I00488 status bit ON.

Pass-Through or Tunneling

Port Mode

Serial I/O

Data Rate

19.2, 38.4 or 175.0 kbps (default)

Flow Control

None

Parity

Odd (default), Even, None

Stop bits

1 (default), 2

Bits/Characters

7 or 8

Station Address
(Byte 1 to Byte 8)

0 (default)

–

For detailed information on the Telnet configuration of the Ethernet Option Module for
each protocol, refer to GFK-2436E or later.

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14.6.4

Enhanced Data Throughput

The versions 3.83 of Micro and later, and versions 2.0 and later of the Ethernet Option
Module firmware provide Enhanced Data Throughput on Port 2 with the Ethernet Option
Module.

•

Data rates supported for the Ethernet Option Module are: 19,200bps, 38,400bps
and 175,000bps. Firmware releases 3.82 and earlier supported data rates 300bps
through 38400 on Ethernet Module. Release 3.83 and later do not support 300bps
through 9,600bps data rates, but support for a higher data rate of 175,000bps is
added.

•

The default baud rate for Port 2 with the Ethernet Option module is 175000bps. This
is the baud rate for which the Micro Port 2 will be configured during auto-
configuration with Ethernet module connected.

•

When 175,000bps data rate is selected, a value of 2ms is automatically selected
internally for SNP T1 timer value (default T1 value is 5 ms). This will result in
increased throughput for communication with SNP protocol.

14.6.5

Setting the IP Address

There are two steps to setting the

module’s IP address, as described in the datasheet that is

packaged with the module:

•

First, a temporary IP address and the MAC address must be entered using PAC
Machine Edition Logic Developer.

•

Second, the permanent IP address must be set using Ethernet commands.

The permanent IP address setting must be saved to the Flash on the Ethernet board or it will
be lost during power cycle.

14.6.6

Downloading Ethernet Drivers

The Ethernet drivers for the Ethernet Option Module are downloaded from

https://www.emerson.com/Industrial-Automation-Controls/support

Filenames

and

passwords are listed in the module datasheet. Downloading is done using the PumpKIN
utility, which is included.

14.6.7

Modbus/TCP Client Support

The versions 3.83 and later of the Micro PLC firmware and version 2.0 of the Ethernet Option
Module provide Modbus TCP Client Support, which allows you to generate read or write
requests to the Modbus TCP server device. To use this feature,

the CPU’s Port 2 must be

configured for Modbus RTU Slave. The Ethernet Option Module acts as Modbus RTU master
on serial side. Because the Micro PLC is configured as RTU Slave, it cannot send the
commands directly to the Ethernet Module. For this reason Micro updates, the Modbus TCP
request at a specified reference memory location, which is read by the Ethernet module to
process the command sent.

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The Ethernet module reads the Modbus command framed by the Micro PLC. The Ethernet
module then communicates with the server device and updates the response back to the
Micro PLC, along with the status. In the Ethernet module, one channel can be configured for
Modbus TCP Client. The remaining channels are used for Modbus TCP Server. The server
should not use the channel configured for client. Similarly, the client should not reclaim the
channels configured for server. Channels should not be switched between client/server
dynamically until you reconfigure the Ethernet module.

To trigger the Modbus/TCP Client request, complete the following steps.

Hardware configuration in Machine Edition. This creates the Sequence and
Command data address configurations.

Configure Modbus/TCP Client and serial parameters in TELNET.

Create logic in Machine Edition to process the Read/Write request.

Note:

The MODBUS_TCP_RW function block should be triggered in the logic only when %I00488 is on.
(When on, the status bit %I488 indicates the Ethernet Option Module is configured for Modbus
Client operation and is ready to accept Modbus

Client commands.) Otherwise error “85B0H” will

be output in the function block status.

Hardware Configuration

In the CPU Settings, set Port 2 Configuration to Ethernet.

Figure 123

On the Port 2 (Ethernet) tab, set the parameters as follows:

Port Mode:

RTU

Port Type:

Slave

Data Rate:

Select data rate (Max: 175000bps).
For details on data rates supported on Port 2, refer to

“Enhanced Data Throughput” on page

252.

Modbus/TCP Client Support:

Enabled

Sequence Numbers Start Address:

Assign %R memory. Occupies 5 words

Command Data Start Address:

Assign %R memory. Occupies 12 words

Note:

Sequence Number and Command Data addresses should not overlap or conflict with any other
variables used in the logic.

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Telnet Configuration

Note:

The Ethernet option module will be power cycled and reset under the following conditions:

•

A connection to the Ethernet option module is established through TELNET and disconnected
immediately.

•

A connection to the Ethernet option module through is established through TELNET, the
configuration is edited, and you press "Q" (Quit without Save).

Connect the PLC with Port 2 to the Ethernet Option Module in the network.

Type TELNET <Ethernet Option Module IP: x.x.x.x> 9999 at the command prompt.

Configure the Modbus/TCP to RTU Bridge as follows:

Sample Modbus/TCP to RTU Bridge Setup

1) Network/IP Settings:

IP Address……………… <x.x.x.x>

Default Gateway ............ <x.x.x.x>

Netmask ................…..... <x.x.x.x>

SNMP is enabled

2) Serial & Mode Settings:

Protocol ...............Modbus/RTU, Slave(s) attached

Modbus/TCP Client .......... disabled

Serial Interface ........…….. 175000,8,O

4) Advanced Modbus Protocol settings:

Slave Addr/Unit Id Source: Modbus/TCP header

Modbus Serial Broadcasts
Disabled (Id=0 auto-mapped to 1)

MB/TCP Exception Codes

Yes (return 00AH and 00BH)

Char, Message Timeout ......

00050msec, 05000msec

D)efault settings, S)ave, Q)uit without save

Select Command or parameter set (1..4) to change:

Attached Device (1=Slave 2=Master)

Modbus/TCP Client Enabled (N) Y

Close Idle TCP sockets after (3-60 sec, 0=leave open)

10 Press Enter

Serial Protocol (1=Modbus/RTU 2=Modbus/ASCII)

Press Enter

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Enter serial parameters (38400,8,0,1) 175000,8,O,1

Modbus/TCP to RTU Bridge Setup

After entering all the values, the Modbus/TCP to RTU Bridge Setup screen appears showing
the configured values.

1) Network/IP Settings:

IP Address 3.212.218.12

Default Gateway

003.212.218.001

Netmask 255.000.000.000

SNMP is enabled

2) Serial & Mode Settings:

Protocol

Modbus/RTU, Slave(s) attached

Modbus/TCP Client enabled

Serial Interface

175000,8,O,1

4) Advanced Modbus Protocol settings:

Slave Addr/Unit Id Source Modbus/TCP header

Modbus Serial Broadcasts

Disabled (Id=0 auto-mapped to 1)

MB/TCP Exception Codes

Yes (return 00AH and 00BH)

Char, Message Timeout

00050msec, 05000msec

D)efault settings, S)ave, Q)uit without save

Select Command or parameter set (1..4) to change:

To save the parameters, press S.

Logic to Process Read/Write Requests

The MODBUS_TCP_RW function block is used to process read/write requests.

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Figure 124

Parameters of MODBUS_TCP_RW

Parameter Data Type, Memory Area Description

Inputs

????

DWord, R

Control word. Requires two bytes in %R memory. Do
not write or clear this memory during operation of
the MODBUS_TCP_RW function.

Enable

Flow

When the function is enabled, the operation is
performed.

Flow

Execute. A low to high transition starts command
processing.

Word, Constant

Channel number on which the request will be
processed. Should be 1.

Word, AI, AQ, R, Constant

Function code. Modbus RTU function to be carried
out. See page 258 for valid function codes.

LMR

Word, AI, AQ, R, Constant

Segment selector for Local reference memory type.
Destination memory type for a Read operation;
Source memory type for a Write operation.

LMR
Value

Description

%Q discrete output memory (Byte mode)

%Q discrete output memory (Bit mode)

%R register memory (Word mode)

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Parameter Data Type, Memory Area Description

LMO

Word, AI, AQ, R, Constant

Local PLC reference memory address for

Modbus/TCP Client device’s location. Destination

for a read operation; Source for a write operation.

RMO

Word, AI, AQ, R, Constant

Remote PLC reference memory address for

Modbus/TCP Server device’s location. Source for a

read operation this memory; Destination for a write
operation.

Word, AI, AQ, R, Constant

For valid lengths refer to the comments in the table

“Modbus/TCP Function Codes Supported by VMNM
PLCs” on page

258.

Word, AI, AQ, R

IP Start address. This is the IP Address of the Server
device. Starting from this address, four words would
contain four octets of the IP.

Word, AI, AQ, R, Constant

Unit Identifier. A control code used in a Modbus/TCP
message. This value is 1 for most Modbus/TCP
devices except for an Ethernet to Serial bridge used
to multi-drop to Modbus RTU devices.
Valid values: 0

—

255

Outputs

ENO

Flow

Enable output.

CMPL

Bool, I, Q, M, G, T

Complete. Set when the read or write operation has
been successfully completed.

BUSY

Bool, I, Q, M, G, T

Busy. Set when the read or write process is in
operation and has not been completed.

ERR

Bool, I, Q, M, G, T

Error. Set when an error is identified during
operation.

STS

Word, AI, AQ, R

Status. May include the following:
Remote Server exceptions
Function block parameter errors
Client application errors
For a list of status/error codes, refer to page 258.

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