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8 I/O CONTROL INSTRUCTIONS
(4) Loop stop processing
(a) Setting 1 in SPA of the alarm detection (ALM) selects a loop stop.
A loop stop performs the following processing and terminates the S.OUT2 instruction.
1) BW retains the last value.
2) DMLA, MHA and MLA of the alarm detection (ALM) are turned to 0.
3) The operation mode (MODE) is changed to MAN.
4) BB1 to BB4 of BB are turned to 0.
(b) Setting 0 in SPA of the alarm detection (ALM) selects a loop run.
A loop run performs "(1) Mode judgment".
(5) Hold processing
Used to specify whether the output value will be held or not by the S.OUT2 instruction is
specified at sensor error occurrence (detected by the S.IN instruction) in the loop stop
processing.
Use SM1501 to select whether the manipulated value (MV) will be held or not at sensor alarm
occurrence.
• SM1501
• SM1501
ERROR
• When an operation error occurs
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OFF: Manipulated value (MV) will not be held.
ON: Manipulated value (MV) will be held.
MELSEC-Q
Error code: 4100
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