4 Remote I/O Master Communications
4-32
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
4-6 Example of User Program for Remote
I/O Communications
When user program are written for remote I/O communications, make sure it performs I/O processing
with a slave under the following conditions:
• *_Mstr1IOCommSta (I/O Data Communications Status) is changed to TRUE.
• *_UnitErr (Unit Error) is changed to FALSE.
Example: There is no jump and slave I/O is processed when the JMP(004) instruction input condition is
FALSE in the following instructions. There is a jump and slave I/O is not processed when the JMP(004)
instruction input condition is TRUE.
Precautions for Correct UsePrecautions for Correct Use
Even if there is a communications error with the slave, the slave input data is saved in the allo-
cated area.
To prevent operating errors, make a user program so that no slave I/O processing will occur
when *_UnitErr (Unit Error) is TRUE.
aaaa_Mstr1IOCommSta
(I/O Data Communications)
STEP1
STEP1:
Processing other than slave I/O
Slave I/O processing
aaaa_UnitErr
(Unit Error)
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