38
Detailed Description of User Settings Area Data
Section 4-2
4-2-7
Alarm Hysteresis Settings
Hysteresis values can be set for the process value alarm outputs. Frequent
ON/OFF switching of the alarm output can be eliminated by setting a dead
zone between the alarm output’s start and stop.
4-2-8
Alarm Output ON Delay Settings
A fixed time delay can be set before the output starts for an alarm output (high
or low limit). The ON delay can be set between 1 and 60 s. Each channel’s
ON delay is set independently, but the same ON delay applies to the channel’s
high and low limit alarms. The alarm output will be turned OFF when the pro-
cess value goes beyond the alarm output’s range (including the hysteresis
value).
The following example shows the operation of the high limit alarm output.
DM word
Function
Set value
m + 20
Input 1 alarm hysteresis set value
0 (0000 hex) to 9,999 (270F hex)
m + 25
Input 2 alarm hysteresis set value
m + 30
Input 3 alarm hysteresis set value
m + 35
Input 4 alarm hysteresis set value
Hysteresis
Hysteresis
Alarm output (H)
Alarm output (L)
Alarm high limit (H)
Process value input
Alarm low limit (L)
DM word
Function
Set value
m + 21
Input 1 alarm ON delay time
0 to 60 s (0000 to 003C hex)
m + 26
Input 2 alarm ON delay time
m + 31
Input 3 alarm ON delay time
m + 36
Input 4 alarm ON delay time
Time
Hysteresis
ON delay time
High limit alarm (H)
Process value input
Alarm output (H)
Summary of Contents for SYSMAC CJ1W-AD04U
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