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Plc-5/slc and micrologix interfaces – Comtrol UP DeviceMaster User Guide User Manual

Page 56

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56 - Chapter 2. Programming Interface

DeviceMaster UP Modbus/TCP User Guide: 2000447 Rev. I

PLC-5/SLC and MicroLogix Interfaces

2.4. PLC-5/SLC and MicroLogix Interfaces

EtherNet/IP firmware versions 2.01 or later supports EtherNet/IP connections to the PLC-5 and SLC PLCs.
As of EtherNet/IP version 3.02, the PLC-5 and SLC interface supports:

Polling, Write-to-File, and Write-to-File-Synced receive communication methods.

PCCC based messages transferred by means of the PCCC object, including:

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SLC Typed Read Message

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SLC Typed Write Message

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PLC-5 Typed Read Message (Logical ASCII address format)

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PLC-5 Typed Write Message (Logical ASCII address format)

Configuration of the DeviceMaster UP only through the embedded web page. There is no DeviceMaster
UP configuration available through the PLC-5 and SLC PLCs. See the following topics for more
information:

-

5.4. SLC or MicroLogix PLC Programming Example Instructions

on Page 116

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5.5. PLC-5 PLC Programming Example Instructions

on Page 143

Receive, transmit and statistics data.

Standard PLC-5/SLC file naming conventions.

Ethernet device interface via Ethernet TCP/IP sockets.

Application interface via Ethernet TCP/IP sockets.

Filtering and data extraction:

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String filtering of up to 128 bytes.

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RFID - EPCglobal tag data filtering and data extraction.

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Barcode - UPC/EAN barcode data filtering and data extraction.

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Independent filtering criteria to the PLC and application.

Serial data packet transfers up to 1518 bytes and socket packet data transfers up to 2048 bytes in the
Write-to-File and Write-to-File-Synced receive methods.

Controlled message rate to the PLC when operating in the Write-to-File receive method. This is
accomplished by setting the Maximum PLC Update Rate.

The primary differences between the PLC-5/SLC interface and the ControlLogix interfaces are:

Since the PLC-5 and SLC PLCs operate on a file memory system, the PLC-5/SLC interface provides
Write-to-File and Write-to-File-Synced communication methods. They operate in a very similar manner to
the Write-to-Tag and Write-to-Tag-Synced methods available for the ControlLogix family of PLCs.

Polling is performed through the PLC-5/SLC specific messages instead of accessing the Serial Port Data
Transfer object.

When configuring the DeviceMaster UP to operate in Write-to-File or Write-to-File-Synced, enter the file
name starting with a $ (i.e. $N10:0) for SLC and PLC-5, and with a # (i.e. #N10:0) for MicroLogix.

The maximum serial and socket port packet sizes in polling mode are smaller due to PCCC message size
limitations.

The configuration options cannot be set through SLC or PLC-5 messages.

Note: While ControlLogix PLCs support the SLC and PLC-5 messages, using those messages on ControlLogix

PLCs is not recommended due to data size and performance considerations. For ease of programming,
Comtrol recommends the Write-to-File receive method used with the Maximum PLC Update Rate option