86
Connect Devices
WAGO-I/O-SYSTEM 750
753-668/000-004 4FAI 0/4-20 mA Diff PROFIsafe
Manual
Version 1.0.0, valid from HW/SW Version 01/01
7.2.2
Using 230 VAC I/O Modules
If 230 VAC I/O modules are used together with F I/O modules in one fieldbus
node, there are two options:
7.2.2.1
230 VAC Modules are Used in Another Fieldbus Node that Contains
no F I/O Modules
You have to use a separate 24 VDC power supply unit (SELV/PELV) for a
fieldbus node that contains F I/O modules. You have to use a PELV or FELV
power supply unit with protective grounding for a fieldbus node without
F I/O modules.
Avoid unacceptably high body voltages!
All 230 V AC voltages applied to the nodes must also be protected by a 30 mA
residual current circuit breaker.
In the simplest case, place the residual current operated circuit-breaker just
behind the junction of the supply network. Doing so allows you to fuse all paths.
Avoid vagabond voltages!
Never use a power supply unit to power fieldbus nodes with F I/O modules and
fieldbus nodes with 230 V I/O modules.
7.2.2.2
230 VAC I/O Modules and F I/O Modules are Used Together in one
Fieldbus Node
An isolation transformer (basic insulation) must be used to supply the voltage for
the 230 VAC I/O modules. Between adjoining 230 VAC and 24 VDC I/O modules,
you have to take into account the double basic insulation and if necessary, use
separation modules 750-616/030-000.
