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2- Inputs and outputs
If the power supply to the WMPro is 24 V AC or DC, there
is one output for 24 V DC and another for 12 V DC. These
outputs can be used to operate relays or as a power sup-
ply for sensors. Be careful not to overload the outputs.
To make space for all the inputs and outputs, the number
of earth terminals (GND) is quite small. Earth terminals are
shared between a number of inputs and outputs. If you
are planning to use a lot of inputs and outputs, you could
add an external earth bar or a row of earth terminals to
make it easier to connect everything up.
The enclosure is designed for DIN rails, and the width is nine modules. The terminal blocks are
divisible to simplify installation and replacement. The four plug-in blocks have dierent widths to
minimise the risk of incorrect connections. The maximum width of the screwdriver you use to con-
nect wires to the terminals should be 2 mm, otherwise you might damage the plastic and dislodge
the screws.
The LEDs on the front indicate the status of the eight
digital inputs and the eight digital outputs. There are also
LEDs for power supply, operating status and alarm status.
Finally, there are LEDs indicating Ethernet, RS485 and
RS232 activity.
Status LEDs
The POWER LED lights up when
the WMPro is connected to the
power supply. The STATUS LED
lights up when the device starts
measuring and controlling. If there
is an error in the device, the STA-
TUS LED start ashing.
I/O type Number Comments
Temperature inputs 8 For 1000 Ω sensors, e.g. Pt1000 or Ni1000. Measur-
ing range 800 Ω to 1580 Ω (= -50 °C to +150 °C for
Pt1000). They also act as digital inputs.
Analog inputs for voltage 4 0 to 10 V, approx. 100 kΩ input impedance. 10 bit
resolution.
Analog inputs for current 4 0 to 20 mA, or 4 to 20 mA. 10 bit resolution.
Digital inputs 8 Digital status inputs DI1 to 4 also act as frequency
inputs or counters up to 200 Hz.
Analog outputs 8 0 to 10 V, max. 2 mA.
Digital outputs 8 Open collector outputs. Max. 36 V and 0.5 A.
Connections
The maximum width of the screw-
driver you use to connect wires
to the terminals should be 2 mm,
otherwise you might damage the
plastic and dislodge the screws.
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