Mitsubishi MELSEC-Q series Programming Manual page 71

(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 at sensor error occurrence
(detected by the S.IN instruction).
A hold processing is performed when the value is determined as RUN at "Loop stop judgement".
Use SM1501 to select whether the manipulated value (MV) will be held or not at sensor alarm occurrence.
• SM1501 = OFF: Manipulated value (MV) will not be held.
• SM1501 = ON: Manipulated value (MV) will be held.
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
4100
When the values of
non-normalized number
When the values of
4140
non-normalized number
4141 When an operation error occurs
Error definition
, , are either a non-numeric or
S1 D2
S2
, , are either a non-numeric or
S1 S2 D2
QnPHCPU QnPRHCPU
–– ––
–– ––
S.OUT2
1
2
3
4
4
6
7
QnUDPVCPU
––
8
––
69