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6EC Directives
xvi
6-3 Conformance to EC Directives
The CPM2B PCs comply with EC Directives. To ensure that the machine or de-
vice in which the CPM2B PC is used complies with EC directives, the PC must be
installed as follows:
1, 2, 3... 1. The CPM2B PC must be installed within a control panel.
2. Reinforced insulation or double insulation must be used for the DC power
supplies used for the communications and I/O power supplies.
3. CPM2B PCs complying with EC Directives also conform to the Common
Emission Standard (EN50081-2). Radiated emission characteristics (10-m
regulations) may vary depending on the configuration of the control panel
used, other devices connected to the control panel, wiring, and other condi-
tions. You must therefore confirm that the overall machine or equipment
complies with EC Directives.
6-4 Relay Output Noise Reduction Methods
The CPM2B PCs conform to the Common Emission Standards (EN50081-2) of
the EMC Directives. However, the noise generated when the PC is switched ON
or OFF using the relay output may not satisfy these standards. In such a case, a
noise filter must be connected to the load side or other appropriate countermea-
sures must be provided external to the PC.
Countermeasures taken to satisfy the standards vary depending on the devices
on the load side, wiring, configuration of machines, etc. Following are examples
of countermeasures for reducing the generated noise.
Countermeasures
(Refer to EN50081-2 for more details.)
Countermeasures are not required if the frequency of load switching for the
whole system with the PC included is less than 5 times per minute.
Countermeasures are required if the frequency of load switching for the whole
system with the PC included is 5 times or more per minute.