Publication 1747-RM001G-EN-P - November 2008
12-12 SLC Communication Instructions
• Local or Remote identifies if the message is sent to a device on a local
network, or to a remote device on another network through a bridge.
Valid options are:
– Local, if the target device is on the local network
– Remote, if the target device is on a remote network
(1)
• Control Block is an integer file address that you select. It is a block of
words, containing the status bits, target file address, and other data
associated with the message instruction.
• Control Block Length is a display-only field that indicates how many
integer file words are being used by the control block.
See Table 12.4 for possible control block lengths.
TIP
The MSG control block length increases from 7 to at least
14 words when changing from an SLC 5/02 to an
SLC 5/03, SLC 5/04, or SLC 5/05 processor program. For
ease of program portability between SLC processors,
dedicate an integer file to each MSG instruction control
block.
Table 12.4 MSG Instruction Control Block Lengths
485 CIF 500 CPU PLC-5 PLC-5 with Logical
ASCII/Symbolic
Addressing
Modbus RTU Master
SLC 5/02 7 7 Not Applicable Not Applicable Not Applicable
SLC 5/03 14 14 14
56
(1)
14
(3)
(Channel 0 only)
SLC 5/04 14 14 14
56
(2)
14
(3)
(Channel 0 only)
SLC 5/05 Channel 0 14 14 14 56
14
(3)
SLC 5/05 Channel 1 51 51 51 93 Not Applicable
(1)
OS302, Series C, FRN 5 or higher with RSLogix 500 version 4.5 or higher.
(2)
OS401, Series C, FRN 5 or higher with RSLogix 500 version 4.5 or higher.
(3)
Series C, FRN 11 or higher with RSLogix 500 version 8.10 or higher.
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