Ny-Series Instructions Reference Manual (W560 - Omron NY532-5400 Reference Manual

2 Instruction Descriptions
StbySeqFlag changes to FALSE when all of the following conditions are met after Enable changes to
TRUE. After StbySeqFlag changes to FALSE, it will not change to TRUE until Enable changes from
FALSE to TRUE.
• Input value X − Reference value Y < Upper deviation set value H − Hysteresis EPS
• −(Input value X − Reference value Y) < Lower deviation set value L − Hysteresis EPS
Upper deviation set value H
Lower deviation set value L
Enable
Standby Sequence Enabled
Flag StbySeqFlag
The data types of X, H, Y, L, and EPS must be either REAL or LREAL. The name of the instruction is
determined by the data types of X, H, Y, L, and EPS. If the name of the instruction is LimitAlarmDvStby-
Seq_LREAL, the data types of X, H, Y, L, and EPS are all LREAL.
Operation of Upper Deviation Alarm QH
Upper deviation alarm QH is the alarm for an upward deviation in respect to reference value Y. The
value of QH changes as shown below while StbySeqFlag is FALSE. You can set the hysteresis to
prevent hunting in the deviation alarm.
• If Input value X − Reference value Y > Upper deviation set value H, then QH is TRUE.
• If Input value X − Reference value Y < Upper deviation set value H − Hysteresis EPS, then QH is
FALSE.
Upper deviation alarm QH
Standby Sequence
Enabled Flag StbySeqFlag
Operation of Lower Deviation Alarm QL
Lower deviation alarm QL is the alarm for a downward deviation in respect to reference value Y. The
value of QL changes as shown below while StbySeqFlag is FALSE. You can set the hysteresis to
prevent hunting in the deviation alarm.
• If −(Input value X − Reference value Y) > Lower deviation set value L, then QL is TRUE.
2-754
X (°C)
StbySeqFlag changes to FALSE when the value of X enters this range
after Enable changes to TRUE.
Y
TRUE
FALSE
TRUE
FALSE
Input value X
Upper deviation set value H
Reference value X
TRUE
FALSE
TRUE
FALSE
StbySeqFlag is TRUE, so QH does not change to TRUE.
Hysteresis
Even when the deviation of X from Y exceeds L,
StbySeqFlag remains FALSE.
Time
Hysteresis EPS
Time

NY-series Instructions Reference Manual (W560)