Allen-Bradley MicroLogix 1400 User Manual

393 Publication 1766-RM001A-EN-P - October 2008
Chapter 22
Communications Instructions
This chapter contains information about the Message (MSG) and Service
Communications (SVC) communication instructions. This chapter provides
information on:
• Messaging Overview on page 393
• SVC - Service Communications on page 396
• MSG - Message on page 398
• The Message Element on page 399
• Timing Diagram for the MSG Instruction on page 407
• MSG Instruction Ladder Logic on page 411
• Local Messages on page 413
• Configuring a Local Message on page 414
• Local Messaging Examples on page 423
• Remote Messages on page 439
• Configuring a Remote Message on page 442
• Configuring a Multi-hop Remote Message on EtherNet/IP
Communication Channel on page 445
• Configuring a MicroLogix 1400 CIP Generic Message via Ethernet on
page 461
• MSG Instruction Error Codes on page 466
• Special Function with MSG instruction on page 468
The communication instructions read or write data to another station.
Messaging Overview
The communication architecture is comprised of three primary
components:
• Ladder Scan
• Communications Buffers
Instruction Used To: Page
SVC Interrupt the program scan to execute the service communications
part of the operating cycle. The scan then resumes at the instruction
following the SVC instruction.
396
MSG Transfer data from one device to another. 398
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Allen-Bradley MicroLogix 1400 Specifications

General

Processor	32-bit
Expansion Modules	Up to 7 expansion I/O modules
Power Supply	24V DC or 120/240V AC
Programming Software	RSLogix 500
Communication Ports	Ethernet, RS-232/RS-485 combo port
Controller Type	Programmable Logic Controller (PLC)
Series	MicroLogix
Digital Outputs	12
Analog Inputs	6 (embedded)
Analog Outputs	2 (embedded)
High-Speed Counter	6 high-speed counters
Pulse Output	2 (embedded)
Ethernet Port	Yes