Watlow 8PID Controller User Manual
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1.1.1 ALARM MODE I/O LINE CONFIGURATION
The alarm mode input and output designations are as follows:
I/O Line Nr.
Input/Output
Designation
00
Output
Loop 1 High Alarm
01
Output
Loop 2 High Alarm
02
Output
Loop 3High Alarm
03
Output
Loop 4 High Alarm
04
Output
Loop 5 High Alarm
05
Output
Loop 6 High Alarm
06
Output
Loop 7 High Alarm
07
Output
Loop 8 High Alarm
08
Output
Loop 1 Low Alarm
09
Output
Loop 2 Low Alarm
10
Output
Loop 3 Low Alarm
11
Output
Loop 4 Low Alarm
12
Output
Loop 5 Low Alarm
13
Output
Loop 6 Low Alarm
14
Output
Loop 7 Low Alarm
15
Output
Loop 8 Low Alarm
16
Input
User Designated
17
Input
User Designated
18
Input
User Designated
19
Input
User Designated
20
Input
User Designated
21
Input
User Designated
1.1.2 ALARM DEADBAND
To prevent oscillating of the alarm output when the measured temperature hovers
around the alarm setpoint, a deadband may be specified. The deadband is defined as
a percentage of the setpoint for all 16 alarm settings.
For high alarms, the alarm output will be set when the measured temperature reaches
the high alarm setpoint but will not be cleared until the temperature drops below its
lower deadband limit.
For low alarms, the alarm output will be set when the measured temperature drops
below the low alarm setpoint and will not be cleared until the temperature rises
above its upper deadband limit.