USER MANUAL Manual

Remote I/O Communications 8–32
Publication 2706-6.1
In Bit Trigger Run Mode you can:
• trigger a message by sending a bit trigger table
• return the message number of the message being run to a PLC
• place messages on the Historical Events Stack
• send messages to the slave address specified as message attribute
• insert ASCII data in a message
• send real-time clock or date data to a PLC
Triggering a Message by Sending a Bit Trigger Table
It takes only a single bit (set) to trigger a message. The position of a
bit (in the Bit Trigger Table) corresponds to a message number. Bit
00 of WORD 1 corresponds to message number 1; bit 01 of WORD
1 corresponds to message number 2; and so on. The total number of
messages that can be triggered depends on rack size allowed:
Communications Method Messages Consisting Of
Discrete I/O -
1
/
4
Rack 17 1 word & Priority Message
Discrete I/O -
1
/
2
Rack 49 3 words & Priority Message
Discrete I/O -
3
/
4
Rack 81 5 words & Priority Message
Discrete I/O - Full Rack 113 7 words & Priority Message
Block Transfer 497 31 words & 1 Priority Message
Note: Unlike the Message/Variable/Slave run mode, you cannot
send variables to be included in a message.
Bit Trigger Run Mode