5 - 3 5 - 3
MELSEC-Q
5 COMMUNICATION USING GENERAL-PURPOSE INPUT/OUTPUT
• X10+ through X1A+ , X20+ through X2F+ • • • General-purpose input
Controls input X of the sequence program by special variable B@.
Example for starting address 40
H
When "1" is set to &H0A by special variable
B@, X5A of the sequence program will be
turned ON.
Y70
X5A
B@(X, &H0A) =1
Communications Module
PLC CPU
• X1B+ • • • Multitask Execution Start
Turns on when the initialization settings are complete and the BASIC multitask
operations are enabled. Multitask Execution Start (X1B+ ) will be turned OFF
when Multitask Execution Stop (X1C+ ) or Communications Module System
Down (X1D+ ) are turned ON.
X1C+ • • • Multitask Execution Stop
Turns ON when an error is generated or when the error handling not performed
and processing does not recover from an error.
X1D+ • • • Communications Module System Down
Turns ON when an error such as shutdown of the communications module
system occurs.
Using the above three inputs, interlocks are placed so that the FROM and TO
instructions or the output device operations shown in Section 5.2 are stopped when the
communications module is not operating normally.
Operation is
acceptable.
Error Detected.
System Down
X1B+
X1C+
X1D+
FROM ………
