Rockwell Automation 900-TC32 Digital Temperature Controllers, Series B - Manual (Page 289)

Publication 900-UM007D-EN-E - January 2011
Parameter Functions & Definitions 5-61
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.)
Related Parameters
• Alarm Value 1…3 (Operation function group, page 5-16)
• Upper-Limit Alarm Value 1…3, Lower-Limit Alarm Value 1…3
(Operation function group, page 5-19)
• Standby Sequence Reset Method (page 5-72), Alarm 1…3 Open in
Alarm, Alarm 1…3 Hysteresis (page 5-61), Alarm 1…3 Latch
(Advanced Setting function group)
Alarm 1 Hysteresis
Conditions of Use: Alarm 1 must be assigned. The alarm 1 type must NOT
be 0, 12, or 13.
12 Loop Break Alarm (LBA)
(Alarm 1 Type only) —
13 PV Change Rate Alarm —
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).
Table 5.BR — Details
Set Value Alarm type
Alarm Output Operation
When Alarm Value
X is Positive When Alarm Value
X is Negative
L H SP L H SP L H SP
L H SP
L H SP
H < 0, L > 0
|H| < |L|
H > 0, L < 0
|H| > |L|
H < 0,
|H| ≥
H < 0,
H > 0,
|H| ≤
H < 0, L > 0
|H| < |L|
H > 0, L < 0
|H| > |L|
H < 0, L
|H| ≥ |
H < 0, L <
H > 0, L <
|H| ≤ |L
L H SP SP L H H SP L
H L SP
SP H L
alh1