Mitsubishi Electric MELSEC-Q QnPHCPU Programming Manual page 132

9 CONTROL OPERATION INSTRUCTIONS
(5) Deviation check
A deviation check is made under the following condition and the result of the check is output to
DVLA of the alarm detection (ALM) and the deviation large alarm (BB1) of the block memory.
DVL
(DVL
|DV|
*1: When DVLI or ERRI in the alarm detection inhibition (INH) is set to 1, DVLA and BB1 show
0 since the alarm is prohibited.
(6) 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.BPI instruction.
1) BW is turned to 0.
2) DVLA of the alarm detection (ALM) is turned to 0.
3) The operation mode (MODE) is changed to MAN.
4) BB1 of BB are turned to 0.
(b) Setting 0 in SPA of the alarm detection (ALM) selects a loop run.
A loop run performs "(7) Control cycle judgment".
(7) Control cycle judgment
(a) If the specified control cycle is not reached, BW is turned to 0 and the S.BPI instruction is
terminated.
(b) When the specified control cycle is reached, "(1) SV setting processing" is performed.
Error
• When an operation error occurs
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Condition
|DV|
DVLS) |DV| DVL
(DVL DVLS)
Result
*1
DVLA BB1 1
DVLA BB1 Last value status hold
DVLA BB1 0
MELSEC-Q
*1
Error code: 4100
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