6
The POA1 control unit can be programmed for two types of STOP
input:
- NC type STOP for connecting up to NC type contacts
- Constant resistance STOP: it enables the user to connect up to the
control unit of devices with 8.2kΩ constant resistance (e.g. sensi-
tive edges). The input measures the value of the resistance and
disables the manoeuvre when the resistance is outside the nomi-
nal value. Devices with normally open “NO” or normally closed
“NC” contacts, or multiple devices, even of different types, can be
connected to the constant resistance STOP input, provided that
appropriate adjustments are made. For this purpose, refer to the
following the table:
Note 1. Any number of NO devices can be connected to each oth-
er in parallel, with an 8.2KΩ termination resistance (Figure 4).
Note 2. The NO and NC combination can be obtained by placing
the two contacts in parallel, and placing an 8.2KΩ resistance in
series with the NC contact. It is, therefore, possible to combine 3
devices: NO, NC and 8.2KΩ).(Figure 5)
Note 3. Any number of NC devices can be connected in series to
each other and to an 8.2KΩ resistance (Figure 6).
Note 4. Only one device with an 8.2KΩ constant resistance output
can be connected; multiple devices must be connected “in cascade”
with a single 8.2KΩ termination resistance (Figure 7)
If the constant resistance STOP input is used to con-
nect devices with safety functions, only the devices with
8.2KΩ constant will resistance output guarantee the fail-
safe category 3.
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