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<6. Parameters>
List of Instrument Alarm Types
The table below shows the types and actions of instrument alarm. In the table, codes 1 to
20 and 28 to 31 are for the primary-loop, codes 41 to 60 and 68 to 71 are for the secondary-loop. Codes 1 to 10 and 41 to 50 are not provided with stand-by actions, while codes 11
to 20 and 51 to 60 are provided with stand-by actions.
Alarm type code
Alarm action
Alarm type
Contact
“Open/close” shows status of relay contact, closes
if alarm
and “lit” and “unlit” shows status of lamp
occurs
No alarm
Open (unlit)
Closed (lit)
PV
Alarm setpoint
Alarm type
Contact
“Open/close” shows status of relay contact, closes
if alarm
and “lit” and “unlit” shows status of lamp
occurs
PV low limit
Closed (lit)
Open (unlit)
Alarm setpoint
PV
Contact
opens
if alarm
occurs
Hysteresis
De-energized
on deviation low
limit alarm
1
11
41
51
Open (lit)
2
12
42
52
Deviation high
and low limits
6
16
46
56
Closed
(unlit)
Deviation
setpoint
PV
Target SP
Hysteresis
Hysteresis
Alarm type code
Alarm action
OFF
Hysteresis
PV high limit
Contact
opens
if alarm
occurs
Closed
(lit)
Hysteresis
Open
(unlit)
Closed
(lit)
PV
Deviation setpoint
7
17
47
57
Target SP
Hysteresis
Deviation high
limit
Closed (lit)
Open (unlit)
Deviation setpoint
PV
Target SP
3
13
43
53
Deviation within
high and low
limits
Hysteresis Closed Hysteresis
(lit)
Open
Open
(unlit)
(unlit)
Target SP
Hysteresis
Deviation low
limit
Closed (lit)
Open (unlit)
Deviation setpoint
PV
Target SP
Hysteresis
4
14
44
54
De-energized on
PV high limit
5
15
45
55
Open (lit)
PV
Deviation
setpoint
Target SP
Closed
(unlit)
Closed (lit)
Open (unlit)
SP
SP low
limit
28
68
Open (unlit)
Output value
Open (unlit)
29
69
PV
Hysteresis
Closed (lit)
Output high limit
30
70
Alarm setpoint
Hysteresis
Closed (lit)
Output low limit
Open (unlit)
Alarm setpoint
SP
10
20
50
60
Closed
(unlit)
Open (lit)
Alarm setpoint
Alarm setpoint
Hysteresis
Closed (lit)
Alarm setpoint
Alarm setpoint
Hysteresis
De-energized on
PV low limit
Hysteresis
SP high
limit
9
19
49
59
Open (lit)
PV
Hysteresis
De-energized on
Closed
deviation high
(unlit)
limit alarm
PV
Deviation setpoint
8
18
48
58
31
71
Output value
The following alarm types are used only for “Instrument Alarm.”
25, 65:
26, 66:
27, 67:
Sensor grounding alarm
Fault diagnosis output (Note 1)
FAIL output (Note 2)
Note 1: The fault diagnosis output turns on in case of input burnout, A/D converter failure, or reference junction compensation
(RJC) failure. For input burnout or A/D converter failure, the control output is set to the setpoint of the Preset Output
Value operating parameter (PO).
Note 2: The FAIL output is on during normal operation and turns off case failure.
Stand-by Action
⬚C
Treated
as normal
Normal
Abnormal
The alarm
output turns on.
Low limit of
alarm setpoint
The alarm output does not
turn on in this region even
if the PV value is below the
low limit of the alarm setpoint.
Power-on
Time
IM 05E01B02-44E
1st Edition : May 31,2000-00