Rockwell Automation 1732DS-IB8 User Manual page 38

34 Understand the Operation of Safety Functions
Publication 1791DS-UM001H-EN-P - April 2009
DeviceNet products that comply with EC directives also conform
to the Common Emission Standard (EN 50081-2). 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 conditions.
You must confirm that the overall machine or equipment
complies with EC directives.
DeviceNet products that comply with EC directives must have
configurations with less than 30 m (98.43 ft) of I/O wiring and
less than 10 m (32.81 ft) of power supply wiring, which applies
to the 1791DS-IB12, 1791DS-IB8XOB8, and 1791DS-IB4XOW4
modules.
The following examples show how to reduce noise.
Reduce electrical noise from the communication cable by
installing a ferrite core on the communication cable within
10 cm (3.93 in.) of the DeviceNet master unit.
Ferrite Core (Data Line Filter) LF130B
(manufactured by Easy Magnet Co.)
Impedance Specifications
Impedance
25 MHz
156
Ferrite Core
mm
(in.)
30
(1.18)
13
(0.51)
Wire the control panel with cables that are as short as
possible and ground to 100
Keep DeviceNet communication cables as short as possible
and ground to 100
Value
100 MHz
250
33
(1.30)
29
(1.14)
or less.
or less.
31522-M