Allen-Bradley MicroLogix 1200 Reference Manual

Publication 1762-RM001C-EN-P
21-32 Communications Instructions
Example 3 - Local Read from a PLC-5
Message Instruction Setup
In this example, the controller reads 10 elements from the target device’s
(Local Node 2) N7 file, starting at word N7:50. The 10 words are placed in
the controller’s integer file starting at word N7:0. If five seconds elapse
before the message completes, error bit MG11:0/ER is set, indicating that
the message timed out.
Valid File Type Combinations
Valid transfers between file types are shown below for MicroLogix
messaging:
Local Data Types Communication Type Target Data Types
O
(1)
, I
(1)
, B, N, L
(1) Output and input data types are not valid local data types for read messages.
<---> read/write O, I, S, B, N, L
T <---> read/write T
C <---> read/write C
R <---> read/write R

Allen-Bradley MicroLogix 1200 Specifications

General

Series	MicroLogix 1200
Type	Programmable Logic Controller (PLC)
Mounting	DIN rail or panel mount
Programming Language	Ladder Logic
Programming Software	RSLogix 500
I/O Points	Up to 40
Communication Ports	RS-232, RS-485
Memory	6 KB user memory
Power Supply	24V DC or 120/240V AC
Expansion	Supports expansion I/O modules
Operating Temperature	0°C to 55°C (32°F to 131°F)
Dimensions	90 mm x 110 mm
Weight	0.5 kg (1.1 lbs)