9-19
9.8 Processing During Forced Input and Output
9.8.1 Processing when forced input/output is initiated during RUN
1. Processing of external input (X)
• Regardless of the state of the input from the input device, forced on/off operation will take precedence
at a contact specified for forced input/output in the above procedure B. At this time, the input LED will
not blink, however, the area of input X in the operation memory will be rewritten.
• Contacts not specified will read in the on/off state according to the condition of the inptu from the input
device.
2. Processing of external output (Y)
• Regardless of the result of operation, forced on/off will take precedence at a contact specified for
forced input/ouput in the above procedure A. At this time, the area of output Y in the operation memory
will be forcedly rewritten. External output will take place according to the input/output update timing in
the above diagram.
• The on/off state of contacts not specified will be determined by the operation result.
3. Processing of Timer (T) and Counter (C)
• Regardless of the timer/counter input condition, forced on/off operation will take precedence at a
contact specified for forced input/output. At this time, the contact of the timer (T) or counter (C) in the
operation memory will be rewritten. Timing and counting will not take place during control.
• The on/off state of contacts not specified will be determined by the operation result.
Operation during operation
For small-sized PLCs FP0, FP1, FPΣ and FP-X
The internal relay R or output Y specified by OT or KP instruction is rewritten according to the results of
operation. However, as the R or Y is set/reset again right before the peripheral service (as the above
procedure C), the monitoring value with the tooling software or the output to external devices is forcibly
rewritten to a specified value.
For medium-sized PLCs FP2 and FP2SH
For the internal relay R and output Y specified by OT or KP instruction, the value of the forced
processing has a priority. When rewritten by a high-level instruction, the result of the instruction has a
priority.
To Next Page
Loading...
Need help?
General
