Connecting Loads Between Ox+ To The Ground Connection 0 V; Figure 32: Connecting Loads From Ox+ To Ground Connection 0 V - WAGO -I/O-SYSTEM 750 Manual

WAGO-I/O-SYSTEM 750
750-667/000-003 4FDI/4FDO 24V/2A PROFIsafe V2 iPar
Open load detection for supply lines to the loads only!
If you connect two loads parallel to a digital power output (as depicted in the
figure), the F I/O module only detects open loads on the supply lines.
Open load detection is not safety related and cannot be part of the safety
function under any circumstances.
7.3.3.7

Connecting Loads between Ox+ to the Ground Connection 0 V

Important note about single fault security
If single fault security is required for the safety function, you must use at least two
positive digital power outputs Ox+ to connect two loads (e.g., two relays)
because each positive digital power output uses only one semiconductor switch
for switching.

Figure 32: Connecting Loads from Ox+ to Ground Connection 0 V

You can connect a load (e.g., a relay) between a positive digital power output
Ox+ and the ground connection of the field supply voltage O v (common ground).
The digital power output Ox- can remain open.
Please observe the following conditions:
• You must connect the voltage supply +24 V and 0 V of the relay to the field
supply voltage U
necessary).
• For single fault security, you need at least two positive digital power outputs
Ox+ and two relays.
• You must connect the normally open contacts (K1 and K2, see figure) of
two relays in series to the load to be switched.
and 0 V of the F I/O module (same reference potential is
v
Version 1.4.2, valid from HW/SW Version 01/02
Connect Devices 77
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