85
Setting Alarm Specifications
Section 5-4
inputs, the decimal point position is determined by the Decimal Point Position
parameter setting. In this case, however, the 0 (****) decimal point position
setting will be treated as setting 1 (***.*).
5-4-4
Standby Sequence
The standby sequence can be used so that an alarm will not be output until
the process value leaves the alarm range once and then enters it again.
For example, with a lower limit alarm, the process value will normally be below
the set point, i.e., within the alarm range, when the power supply is turned
ON, causing an alarm to be output. If the lower limit alarm with standby
sequence is selected, an alarm will not be output until the process value
increases above the alarm set value, i.e., until it leaves the alarm range, and
then falls back below the alarm value.
■
Restarting the Standby Sequence
• If an alarm is output, the standby sequence is canceled, but the standby
sequence will start again after any of the following operations.
Standby sequence canceled
Alarm value
Alarm type: Lower-limit alarm with
standby
sequence
Time
Alarm hysteresis
Alarms
(with standby sequence)
Alarms
(without standby sequence)
Process
value
Restart conditions • When control starts (including power ON) or when the alarm
value (upper/lower-limit alarm value) or input shift value
(upper/lower-limit temperature input shift value) is changed
• When the set point is changed
• When the bank is switched
• When the alarm type is changed
Alarm value
(after change)
Alarm hysteresis
Alarm output
SP changed
Alarm
: Standby sequence canceled
: Standby sequence restarted
Summary of Contents for EJ1G
Page 3: ...iv ...
Page 17: ...xviii ...
Page 21: ...xxii ...
Page 53: ...32 Unit Configuration Examples Section 2 4 ...
Page 69: ...48 Changing SPs During Operation Section 3 3 ...
Page 81: ...60 Other Functions Section 4 5 ...
Page 145: ...124 Other HFU Functions Section 5 7 ...
Page 167: ...146 Detailed Description of Services Section 6 4 ...
Page 229: ...208 Parameters That Can Be Allocated for Programless Communications Appendix ...
Page 237: ......