User`s manual

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MELSEC-Q
9 CONTROL OPERATION INSTRUCTIONS
(b) The change of the input data is compared with the change rate alarm value (DPL) in each
execution cycle (
T).
Check item Condition ALM BB4 BB5
E1
n
+
m
E1
n
DPL
DPPA
1
*1
1
*1
Others DPPA
00
E1
n
+
m
E1
n
DPL
DPNA
1
*2
1
*2
Change rate check
Others DPNA 0
0
*1: When DPPI or ERRI in the alarm detection inhibition (INH) is set to 1, DPPA and BB4 show 0 since
the alarm is prohibited.
*2: When DPNI or ERRI in the alarm detection inhibition (INH) is set to 1, DPNA and BB5 show 0 since
the alarm is prohibited.
(4) Engineering value conversion
Engineering value conversion is made with the following expression.
E1
RL
100
PV
RH
RL
(5) 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.PHPL instruction.
1) Engineering value reverse conversion is performed with the following expression.
(PV
RL
100
BW
RH
RL)
2) BB1 to BB5 of BB are turned to 0.
3) DPNA, DPPA, LLA, HHA, PLA and PHA of the alarm detection (ALM) are turned to 0.
(b) Setting 0 in SPA of the alarm detection (ALM) selects a loop run.
A loop run performs "(1) Engineering value reverse conversion".
Error
• When an operation error occurs Error code: 4100