Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

Publication 1763-RM001C-EN-P - October 2009
Protocol Configuration 511
DF1 Half-Duplex Master MSG-based Polling Mode Operation
With MSG-based Polling Mode, the master device only initiates
communication with a slave when a MSG instruction to that slave is
triggered in ladder logic. Once the read or write command has been
transmitted, the master waits the Reply MSG Timeout period and then
polls that slave for a reply to its command. The master can be configured
either to ignore (“MSG-based Polling, don’t allow slaves to initiate”) or to
accept (“MSG-based Polling, allow slaves to initiate”) MSGs that may have
been triggered and queued up in the slave.
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Allen-Bradley MicroLogix 1100 Specifications

General

Processor	32-bit
Programming Software	RSLogix 500
Mounting	DIN rail or panel mount
Power Supply	24V DC
Type	Compact PLC
Digital Inputs	12
Digital Outputs	8
Analog Inputs	4 (depending on model)
Analog Outputs	Optional with expansion module
Programming Language	Ladder Logic
Operating Temperature	0 to 55 °C (32 to 131 °F)
Series	MicroLogix