Allen-Bradley MicroLogix 1200 Reference Manual page 330

21-30 Communications Instructions
Publication 1762-RM001C-EN-P
Example 1 - Local Read from a 500CPU
Message Instruction Setup
In this example, the controller reads 10 elements from the target'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
(1) (1) <---> read/write
O , I , B, N, L
T <---> read/write
C <---> read/write
R <---> read/write
(2) --->
RTC
(1) Output and input data types are not valid local data types for read messages.
(2) 500CPU write RTC-to-Integer or RTC-to-RTC only. Applies to MicroLogix 1200 Series B
and later, and 1500 Series B and later only.
O, I, S, B, N, L
T
C
R
write N, RTC