Weidmuller WI-I/O-EX: Wireless I/O Expansion Modules v1.11 - Manual (Page 10)

WI-I/O-EX Serial I/O Module User Manual v1.11
Page 10 February 2010
2 Installation
All connections to the module should be SELV only. Normal 110/220/240V mains
supply should not be connected to any input terminal of the module.
2.1 General installation
Several WI-I/O-EX modules may be connected to one master via RS485 multi-drop
connection as shown in Figure 2-1. Ensure there is good grounding between the WI-I/O-
EX units and the master. A 2.5 mm 2 / 12 gauge earth wire is recommended.
Figure 2-1: Several WI-I/O-EX units connected to a master.
2.1.1 Power Connection
The WI-I/O-EX modules require a 10.8-30 VDC ** power supply. This is supplied to the
4-way connector, shown in Figure 2-2.
Figure 2-2: Power and RS485 connector. Connect 10.8-30 VDC** to + and earth to -.
Connect RS485 to B and A.
** Model Dependent. Check rear label for actual operating voltages
2.1.2 Address Switches
The address switches are found on the bottom panel of the module, as shown in Figure
2-3. If you are using the WI-I/O-EX module with other modules WI-I/O 9, WI-MOD-9-E
and WI-MOD-E modules), the address switches must be set to “00”. This enables E-
Series protocol mode.
If you are using a ModBus Master device, ensure each WI-I/O-EX connected to the same
ModBus master has a unique ModBus address.
Note that the module must be reset after changing the address switches.
Master
WI-I/O-EX
B A - +
WI-I/O-EX WI-I/O-EX