Delta RMC101 User Manual download pdf (Page 502)

100

101

RMC100 and RMCWin User Manual

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• SLC Protected Typed Write with 3 Address Fields (CMD=0x0F, FNC=0xAA)

• SLC Protected Typed Read with 3 Address Fields (CMD=0x0F, FNC=0xA2)

• Echo (CMD=0x06, FNC=0x00)

• Diagnostic Status (CMD=0x06, FNC=0x03)

Most of the above functions address memory in the remote device. The RMC has memory

registers defined (N7:0-255 and N9:0-N255:255) as described in the following topic:

• RMC Register Map (Allen-Bradley)

Protocol-Specific Settings

The RMC DF1 implementation has two protocol-specific settings:

• Node Address: Select a node address for the RMC that is unique to the DF1 network. This

address will be entered in the master's request to identify the slave that should respond.

• Error Checking: Select one of the two error checking methods, BCC or CRC. Each provides

error checking on the packet level. CRC is mathematically better at catching a lot of common

types of errors, and as such is preferred. However, if the master does not support CRC then

BCC must be used.

See Configuring the RMC SERIAL for details on using the Serial Module Options dialog box to

change these and other RMC SERIAL options.

PLC Support for DF1

DF1 is a major industrial serial protocol supported by a large number of devices, both those built

by Allen-Bradley and other companies. Any DF1 master implementation that uses the above

blocks should also be able to read and write from the RMC.

Each Allen-Bradley PLC uses the Message (MSG) ladder logic block to initiate reads and writes

over a serial port. For full details on this block, refer to Allen-Bradley’s Instruction Set Reference

Manual for the appropriate PLC. While the same block is used by each PLC, the semantics differ

slightly for each. Below are specific instructions for the PLC-5, SLC 5/0x, and MicroLogix. This

documentation came using RSLogix 5 version 3.2.0.0 and RSLogix 500 version 4.10.00.

• Allen-Bradley PLC-5

The PLC-5 MSG block is displayed as follows:

• Control: This parameter points a message (MG) file type element or a block of integer (N)

file type elements. The number of N-file elements required varies from 11 to 15; look at the

BLOCK SIZE field in the setup screen for the exact size. Set this to an unused block of

registers, and then use the Setup Screen option in the MSG ladder logic block to modify

those register values:

• This PLC-5: This section holds parameters for the PLC-5.

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