Settings
Instruction Manual FireGuard 2
13542E/5
55
8.3
Setting the outputs for limit monitoring
8.3.1
General information on limit monitoring
Two digital outputs (O1/O2) are available for the status output of faults and limits. These
two outputs (O1/O2) are coded. The states of these outputs are also available via the field-
bus interface, although no physical outputs are present in this case.
The following two modes are available for monitoring the limits:
▪
In mode 1, one limit level (alarm) is monitored
▪
In mode 2, two limit levels (pre-alarm and factory-set main alarm) are monitored
Both modes are described in detail in the following Section 8.3.2 and Section 8.3.3:
8.3.2
Mode 1
Mode 1 is active if the limits 5 .. 8 in the
Limits
menu are all set to
inactive
. Output 1 is
used for when the limit is exceeded (alarm) and output 2 for the fault messages.
Outputs O1 and O2 can be inverted. On output 1, the behavior in the event of a fault can
also be defined. If
Fault
is activated on output 1 (O1), then this is activated both when a
limit is exceeded and in the event of a fault on the instrument. The three states Normal,
Alarm and Fault are not coded.
The following table shows how the behavior of the outputs (A1/A2) can be influenced:
O1 Limit
Invert
No
Yes
No
Yes
No
Yes
No
Yes
Fault
No
No
No
No
Yes
Yes
Yes
Yes
O2 Fault
Invert
No
No
Yes
Yes
No
No
Yes
Yes
State
O2 O1 O2 O1 O2 O1 O2 O1 O2 O1 O2 O1 O2 O1 O2 O1
Normal
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
Alarm 1
0
1
0
0
1
1
1
0
0
1
0
0
1
1
1
0
Fault
1
0
1
1
0
0
0
1
1
1
1
0
0
1
0
0
0 = high-resistance output
1 = low-resistance output
