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Mechanical and Electrical Configuration
Connecting Digital
You plug all I/O modules into bus units. You wire the terminal blocks of the
Modules
bus units. The information that follows describes connections to screw–type
terminals.
However, you can also use crimp snap–in connections. In both cases, you
will find the terminal assignments on the blocks.
Table 3-2 shows the assignment that always applies when you connect the
load voltage.
Table 3-2
Caution
!
After the L+ supply is switched off, energy is stored in digital outputs in an
internal capacitor for about 100 ms.
This energy can be sufficient to activate small loads (e.g. pulse valves) when
an output is triggered.
Connecting Four–
Because all four–channel modules are designed for a two–wire connection,
Channel Digital
you can wire directly to a sensor or an actuator without using an external dis-
Modules
tribution block.
All 24 V DC four–channel digital modules have a red F LED to indicate
faults. This LED signals a failure of the load voltage. Where inputs are con-
cerned, this LED also indicates a short circuit of M in the sensor lines. Where
outputs are concerned, this LED indicates an output error.
The 115 V AC/230 V AC input modules have no fault LED. The
115 V AC/230 V AC output modules have an LED to indicate a defective
fuse. The four channels of a module are numbered from .0 to .3. A pair of ter-
minals on the terminal block is assigned to each channel.
The terminal assignment and the connection diagram are printed on the front
panel of the module.
When there is a short in the output circuits, the four–channel output modules
generate a fault signal. You can evaluate this fault signal as a diagnostics sig-
nal via the I/O bus.
3-16
Connecting the Load Voltage to the Terminal Block of a Bus Unit
Load Voltage
24 V DC
115 V AC/230 V AC
Terminal 1
Terminal 2
L+
M
L1
N
ET 200U Distributed I/O Station
EWA 4NEB 812 6087–02b
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