Allen-Bradley MicroLogix 1400 User Manual

Publication 1766-RM001A-EN-P - October 2008
500 Socket Interface Using CIP Generic Messaging
Read
The Read service reads data on a socket. You can specify a number of
bytes to receive. The Read service returns the number of bytes received.
For TCP, the Read service returns when any data is received, up to the
requested number of bytes. The Read service can return fewer bytes than
were requested. Your application might need to issue multiple Read
requests to receive an entire application message.
For UDP, the Read service completes when a datagram is available
MSG Configuration Parameters
To call this service, click "Setup Screen" in the MSG instruction and enter
the values displayed below.
Parameter Value
Service Type Read
Service Code 4D (hexadecimal)
Class 342 (hexadecimal)
Instance 0. Use a relay ladder instruction to move the returned
instance number from a CreateSocket service into the
MGx:y.TFN element of a MSG instruction
Attribute 0
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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