Mitsubishi Electric MELSEC iQ-R Series - Page 1288

1286
11 PROCESS CONTROL INSTRUCTIONS
11.3 Control Operation Instructions
• A change in the input data and variation rate alarm value (DPL) are compared every execution cycle (T).
*1 If ERRI or DPPI of disable alarm detection (INH) is set to 1, the DPPA of ALM and BB4 are set to 0.
*2 If ERRI or DPNI of disable alarm detection (INH) is set to 1, the DPNA of ALM and BB5 are set to 0.
■Engineering value transformation (4)
The instruction performs engineering value transformation using the following expression.
■Loop stop processing (5)
The following processing is performed according to the SPA status of the alarm detection (ALM).
Operation error
Check item Condition ALM BB4 BB5
Variation rate check E1
n+m
-E1
n
DPL DPPA = 1
*1
1
*1

Others DPPA = 0 0 
E1
n+m
-E1
n
 - DPL DPNA = 1
*2
 1
*2
Others DPNA = 0  0
SPA status Processing details
1 The loop stops. When the loop stops, the following operations are performed and the S.PHPL instruction ends.
• The instruction performs engineering value inverse transformation using the following expression.
• The alarm bits (BB1, BB2, BB3, BB4, and BB5) are set to 0.
• The DMLA, MHA, and DLA of alarm detection (ALM) are set to 0.
0 The loop runs and "engineering value inverse transformation (1)" is performed.
Error code
(SD0)
Description
3400H An invalid operation (such as division by zero) is performed.
3402H The value specified by (s1) or (d2) is a subnormal number or NaN (not a number).
3403H An overflow has occurred.
3405H Variation rate alarm value (DPL) <- Variation rate alarm value (DPL)
The execution cycle (T) setting is less than 0.
Variation rate alarm check time (CTIM) < 0
(Variation rate alarm check time (CTIM)execution cycle (T)) > 32767
PV= ×E1+RL
100
RH-RL
BW= ×(PV-RL)
RH-RL
100