Mitsubishi Electric MELSEC-Q QnPHCPU Programming Manual page 117

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 of the alarm detection inhibition (INH) is 1, DVLA and BB1 turn to 0 since the
alarm is inhibited.
(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.SPI 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) Operating time/hold time check judgment ".
(7) Operating time/hold time check judgment
Whether it is the operating time (ST) or hold time (HT
following processing is performed.
(a) Operating time (ST)
SV setting processing, tracking processing, gain (Kp) operation processing, PI operation
(operating time) and deviation check are performed.
(b) Hold time (HT
Tracking processing, SPI operation (hold time) and deviation check are performed.
Under the following condition, however, the hold time is set to 0 and continuous PI control
is carried out.
STHT
When the integer part of
unchanged.)
Error
• When an operation error occurs
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Condition
|DV|
DVLS) |DV| DVL
(DVL DVLS)
STHT
ST
T T
DVLA
DVLA
DVLA
ST)
STHT
is 0, no processing is performed. ( MV also remains
T
MELSEC-Q
Result
*1
BB1 1
BB1 Last value status hold
BB1 0
STHT ST) is judged and the
Error code: 4100
*1
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