Analog Modules and RF Interference
All Automationdirect products are tested to withstand field strength levels up to 10V/m,
which is the maximum required by the relevant EU standards. While all products pass this
test, analog modules will typically exhibit deviations of their readings. This is quite normal;
however, systems designers should be aware of this and plan accordingly.
When assembling a control system using analog modules, these issues must be adhered to and
should be integrated into the system design. This is the responsibility of the system
builder/commissioner.
Network Isolation
For safety reasons, it is a specific requirement of the Machinery Directive that a keyswitch that isolates
any network input signal during maintenance must be provided, so that remote commands cannot be
received that could result in the operation of the machinery. The FA–ISOCON does not have a
keyswitch! Use a keylock and switch on your enclosure, which, when open, removes power from the
FA–ISOCON. To avoid the introduction of noise into the system, any keyswitch assembly should be
housed in its own earth grounded steel box and the integrity of the shielded cable must be maintained.
Again, for further information on EU directives we recommend that you get a copy of our EU
Installation Manual (DA–EU–M). Also, if you are connected to the World Wide Web, you can check
the EU Commission’s official site at: http://ec.europa.eu/index_en.htm.
DC Powered Versions
Due to slightly higher emissions radiated by the DC powered versions of the DL205, and the
differing emissions performance for different DC supply voltages, the following stipulations
must be met:
• The PLC must be housed within a metallic enclosure with a minimum amount of orifices.
• I/O and communications cabling exiting the cabinet must be contained within metallic
conduit/trunking.
DL205 Installation and I/O Manual, 2nd Edition
A-8
Appendix A: European Union Directives (CE)
A
2
3
4
5
H
7
10
A
10
11
12
13
14
A
B
C
D
