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Chapter 6 Messaging
Enter a Message
Use relay ladder logic to enter a MSG instruction. Click to configure the
MSG instruction, as shown in the example below.
EXAMPLE
Enter a MSG instruction as shown below.
ATTENTION:
If user_bit and count_messages.EN = 0 (MSG instruction
is not already enabled), then execute a MSG instruction that sends data
to another controller.
TIP We recommend an XIO of the MSG control block tag.en, such as the
count_messages.EN portion of this rung, as an in-series precondition for
all message instructions.
Do not manipulate the control bits of a message instruction.
Configure a Message
Instruction
To configure a MSG instruction, perform this procedure.
1. Click in the MSG box.
The Module Configuration dialog box appears.
2.
From the Message Type pull-down menu, choose a message type.
3. In the Source Element field, type the appropriate information.
4.
In the Number of Elements field, enter the number of elements.
88 Rockwell Automation Publication CNET- UM001E-EN-P - June 2016