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Verify Changes to a
Channel Configuration
When changing a channel configuration, there is always a delay until
the ladder logic reads the new data word based on the new
configuration. Therefore, it is important to verify that the module
successfully stored the new channel configuration word. The
following example explains how to verify a change to a channel
configuration.
EXAMPLE
We do this by adding rung 2:3 to the rungs in the previous example.
Program
Rung 2:0
Set up all four channels
S:1
] [
15
Rung 2:1
Set channel 2 to CJC
I:1.0
] [
0
Rung 2:2
Set channel 2 back to Type K
I:1.0
]/[
0
Rung 2:3
Check that the configuration written to channel 2
is being echoed back in channel 2's status word.
EQU
EQUAL
Source A
Source B
Rung 2:4
Change the channel configuration word and verify the change
by comparing the resulting status word with the configuration
word for equality.
B3
[OSR]
0
B3
[OSR]
1
I:3.6
O:3.2
END
Ladder Programming Examples
COP
COPY FILE
Source
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Dest
#O:3.0
Length
MOV
MOVE
Source
N10:4
Dest
O:3.2
MOV
MOVE
Source
N10:2
Dest
O:3.2
Data valid
Publication 1746-UM614B-EN-P - September 2007
61
4
B3
( )
3
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