Rockwell Automation 900-TC32 Digital Temperature Controllers, Series B - Manual (Page 113)

Publication 900-UM007D-EN-E - January 2011
Configuration & Basic Operation 3-43
Note: Shading indicates default setting. Set the alarm type independently for
each alarm in the Alarm 1 to 3 Type parameters in the Initial Setting
function group. The default is 2 (Upper-limit alarm).
➊ With set values 1, 4 and 5, the upper- and lower- limit values can be set independently for each alarm type, and
are expressed as “L” and “H.”
➋ Set value: 1 (Upper- and Lower-Limit alarm)
➌ Set value: 4 (Lower-Limit range)
➍ Set value: 5 (Upper- and Lower-Limit with standby sequence)
For the Lower-Limit alarms in cases 1 and 2 above, the alarm is normally OFF if upper- and Lower-Limit
hysteresis overlaps. In case 3, the alarm is always OFF.
➎ Set value: 5 (The alarm is always OFF if upper- and Lower-Limit alarm hysteresis with standby sequence
overlaps.)
9 Absolute-value
Lower-Limit
10 Absolute-value
Upper-Limit with standby
sequence
11 Absolute-value
Lower-Limit with standby
sequence
12 Loop Break Alarm (LBA)
(Alarm 1 Type only) —
13 PV Change Rate Alarm —
Table 3.N — Alarm Values
Set Value Alarm Type
Alarm Output Operation
When Alarm Value
X is Positive When Alarm Value
X is Negative
ON
OFF
X
0
ON
OFF
X
0
X
ON
OFF
0
X
ON
OFF
0
ON
OFF
X
0
ON
OFF
X
0
L H SP L H SP L H SP
L H SP
L H SP
Case 1 Case 2 Case 3 (Always ON)
H < 0, L > 0
|H| < |L|
H > 0, L < 0
|H| > |L|
H < 0, L > 0
|H| ≥ |L|
H < 0, L < 0
H > 0, L < 0
|H| ≤ |L|
Case 1 Case 2 Case 3 (Always OFF)
H < 0, L > 0
|H| < |L|
H > 0, L < 0
|H| > |L|
H < 0, L > 0
|H| ≥ |L|
H < 0, L < 0
H > 0, L < 0
|H| ≤ |L|
L H SP SP L H H SP L
H L SP
SP H L