Omron E5ZN-DRT Operation Manual page 14

EC Directives
6-2 Conformance to EC Directives
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The E5ZN-DRT DeviceNet Communications Unit complies with EC Directives.
To ensure that the machine or device in which the Unit is used complies with
EC Directives, the Unit must be installed as follows:
1. The Unit must be installed within a control panel.
2. You must use reinforced insulation or double insulation for the DC power
supplies used for the communications power supply, internal power supply,
and I/O power supplies.
3. Units complying with EC Directives also conform to the Common Emission
Standard (EN50081-2). Radiated emission characteristics (10-m regula-
tions) may vary depending on the configuration of the control panel used,
other devices connected to the control panel, wiring, and other conditions.
You must therefore confirm that the overall machine or equipment complies
with EC Directives.
The following example shows one means of reducing noise.
1. Noise from the communications cable can be reduced by installing a ferrite
core on the communications cable within 10 cm of the DeviceNet Unit.
30 mm
13 mm
Ferrite Core (Data Line Filter): 0443-164151 (manufactured by Fair-Rite Prod-
ucts Co., Ltd.)
Impedance specifications
25 MHz: 105
100 MHz: 190
30 mm
13 mm
29 mm
33 mm
2. Wire the control panel with as thick and short electric lines as possible and
ground to 100 min.
3. Keep DeviceNet communications cables as short as possible and ground
to 100 min.
33 mm
29 mm
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