• The connection lines to the relay outputs, binary inputs, and analog outputs must be
shielded.
• The analog outputs are oating, but have a common negative pole.
• As a measure to suppress sparking across the relay contacts (e.g. limit relays), RC elements
must be connected as shown in the following gure. Note that the RC element results in a
drop-out delay for an inductive component (e.g. solenoid valve). The RC element should be
sized according to the following rule of thumb:
– R = R
L
/2; C = 4L/R
2
L
,
where R = 100 Ω and C = 200 nF are sucient.
– You must use a non-polarized capacitor for the RC element.
6ROHQRLGYDOYH
'HYLFHVLGH
&RQQHFWLRQVLGH
24 V
R
C
Figure 5-2 Measure to suppress sparks on a relay contact
When operated with direct current, a spark suppression diode can be installed instead of the RC
element.
Connect the signal lines to the Sub-D plugs at the rear of the device.
Refer to the ELAN interface description (Order No. C79000-B5200-C176 German, C79000-
B5276-C176 English) for details on the interface cable.
5.3.2 Power connection
NOTICE
Incorrect power supply
Check before connecting that the existing supply voltage corresponds to that specied on the
label of the device.
Install the power line separately from the signal lines.
A power supply cable or an appliance plug is enclosed with the device, and must only be
connected by qualied personnel (see Qualied Personnel (Page 11)). The cable is connected to
the appliance socket at the rear of the device. At the power supply end, the cable is inserted into
a mains socket.
Connecting
5.3 Electrical connection
ULTRAMAT 23
Equipment Manual, 04/2022, A5E37100388-012 73
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