Omron C200HW-CORT21, Operation Manual

Page: 16 / 62

EC Directives
Section 6
xiv
addition to any provided within the PLC to ensure safety.
6 EC Directives
1,2,3…
1,2,3…
C200HW-CORT21 Units that meet EC directives must be installed as
follows:
1. C200HW-CORT21 Units are defined for installation inside control panels.
All C200HW-CORT21 Units must be installed within control panels.
2. Use reinforced insulation or double insulation for the DC power supplies
used for the communications power supply, internal circuit power supply,
and the I/O power supplies.
3. C200HW-CORT21 Units that meet EC directives also meet the common
emission standard (EN50081-2). When C200HW-CORT21 products are
built into equipment, however, the measure necessary to ensure that the
standard is met will vary with the overall configuration of the control
panel, the other devices connected tot the control panel, and other
conditions. You must therefore confirm that EC directives are met for the
overall machine or device.
The following examples show 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 C200HW-
CORT21 Unit.
2. Wire the control panel with a thick and short electric lines as possible and
ground to 100
Ω
or less.
3. Keep the communications cables as short as possible and ground to
100
Ω
or less.