Mitsubishi MELSEC-Q series Programming Manual page 187

(5) 3-position ON/OFF control
BB1 and BB2 of BB are output under the following condition.
Condition
BW  75%
25%  BW < 75%
BW < 25%
(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.ONF3 instruction.
1) BW, BB1 and BB2 retain the last values.
2) The operation mode (MODE) is changed to MAN.
(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
1) When the operation mode (MODE) is any of CSV, CCB, CAB, CAS, AUT, LCC and LCA, BW is retained and the
S.ONF3 instruction is terminated.
2) When the operation mode (MODE) is any of MAN, CMB, CMV and LCM, BW is made equal to MV and the
processing of "(5) 3-position ON/OFF control" is performed.
(b) If the specified control cycle is reached, "(1) SV setting processing" is performed.
Operation Error
In the following cases, the error flag (SM0) turns ON and the error code is stored in SD0.
Error code
When an operation error occurs
When HS0 < 0
When the values of
normalized number
4100
When CT < 0 or the execution cycle (SD1500) < 0
When (HS1 + HS0) < 0
When HS1 < 0
When the values of
4140
normalized number
When an operation error occurs
4141
When HS0 < 0
BB1
1
0
0
Error definition
, are either a non-numeric or non-
D2
S1
, are either a non-numeric or non-
S1 D2
BB2
0
0
1
QnPHCPU QnPRHCPU
–– ––
–– ––
–– ––
S.ONF3
9
2
3
4
4
6
7
8
QnUDPVCPU
––
––
––
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