Siemens OXYMAT 64 - Relay Outputs (Function 71)

Operation
5.4 Operating functions
OXYMAT 64
82 Operating Instructions, 06/2008, A5E00880383-03
You can invert the analog output with softkey 2: e.g. 0 - 10 vpm O
2
≡ 0 - 20 mA ≡ 0 - 10 vmp
O
2
≡ 20 - 0 mA.
With softkey 3, you can suppress the negative measured values. If a negative value has an
unfavorable effect on further processing, the negative measured values at the analog output
can be limited to 0 (or 2/4/3.8 (NAMUR) mA) when this function is activated. The display
continues to show the actual measured value.
Table 5- 5 Configurations of the analog output
Measuring range limit in normal
operation
Measuring range limit in case of fault /
CTRL
Defined analog
output / mA
Start-of-scale
value / mA
Full-scale value /
mA
Start-of-scale
value / mA
Full-scale value /
mA
0 – 20 -1 21 0 21
2 – 20 1 21 2 21
4 – 20 2 21 4 21
4 – 20 (NAMUR) 3,8 20,5 3 21,5
Note
If the electronics is defective, it is possible that the analog output may get stuck at approx. -1
mA or approx. +24 mA.
5.4.6.3 Relay outputs (function 71)
71 Relay outputs O
2
R 1 Fault
R 2 Main. req.
R 3 Funct. cont.
R 4 Vacant
...cont.
Figure 5-48 Assigning the relays
There are six freely configurable relays included in the standard equipment whose
switchable output contacts (max. 24 V/1 A) can be used for signaling, actuating valves, etc.
If these six relays are insufficient, you can retrofit additional electronics with eight further
relays (optional board).
With this function, you can assign each relay functions listed in the table "Relay outputs",
whereby you may only assign each function once. In other words, for example, "Fault" may
not be assigned to two relays at the same time.