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11 PROCESS CONTROL INSTRUCTIONS
11.3 Control Operation Instructions
■Loop stop processing (6)
The following processing is performed according to the SPA status of the alarm detection (ALM).
■Control cycle determination (7)
If the specified control cycle is not reached, BW (MV) is set to 0 and the S.PID instruction is terminated.
If the specified control cycle is reached, "SV setting processing (1)" is performed.
SPA status Processing details
1 The loop stops. When the loop stops, the following operations are performed and the S.PID instruction ends.
• The output value (BW (MV)) is set to 0.
• The DVLA of alarm detection (ALM) is set to 0.
• The control mode (MODE) is set to MAN.
• BB1 of BB is set to 0.
0 The loop runs and "control cycle determination processing (7)" is performed.
Error code
(SD0)
Description
3400H An invalid operation (such as division by zero) is performed.
3402H The value specified by (s1), (s2), or (d2) is a subnormal number or NaN (not a number).
3403H An overflow has occurred.
3405H The control cycle (CT) setting is less than 0.
The execution cycle (T) setting is less than 0.
The value divided the control cycle (CT) by the execution cycle (T) exceeds 32767.
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