Rockwell Automation Publication 1756-UM001M-EN-P - February 2012 121
Serial Communication (1756-L6x controllers only) Chapter 6
Use this table as a reference when specifying settings for the protocols
listed.
Program the Message Instruction
Add and configure the Message instruction according to the protocol you are
using. For more information about specifying the configuration details, see the
Logix5000 Controllers General Instruction Reference Manual, publication
1756-RM003
.
Field DF-1 Master Protocol DF-1 Slave Protocol DF-1 Radio Modem Protocol
Station Address Controller station address number Controller station address number Controller station address number
Transmit Retries 3 3 N/A
ACK Timeout 50 N/A N/A
Slave Poll Timeout N/A 3000 N/A
Reply Message Wait 5 N/A N/A
Polling Mode Message: polls the slave by using the Message
instruction
Slave: initiates messages for slave-to-slave
broadcast
Standard: schedules polling for the slave
N/A N/A
EOT Suppression N/A Disable N/A
Error Detection BCC BCC BCC
Duplicate Detection Enabled Enabled N/A
Enable Store and Forward N/A N/A Choose enable if you want to use the store
and forward tag.
The last bit of the INT[16] Enable Store and
Forward array must be ’enabled.’ For
example, say you create an INT[16] tag
named EnableSandF. Then
EnableSandF[15].15 must be set to 1 for
broadcast to work on radio modem.
When using structured text, broadcast over a serial port is set by typing
MSG(aMsg) and right-clicking a MSG to display the Message Configuration
dialog box.
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