Rockwell Automation 1791DS-IBxxxx Guard I/O DeviceNet Safety Modules - Manual (Page 42)

42 Rockwell Automation Publication 1791DS-UM001J-EN-P - May 2013
Chapter 2 Understand the Operation of Safety Functions
Examples to Reduce Noise
These examples show how to reduce noise in 1791DS-IB12, 1791DS-IB8XOB8,
and 1791DS-IB4XOW4 modules.
EXAMPLE 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. Use Ferrite Core (Data Line Filter) LF130B, manufactured by
Easy Magnet Co., or an equivalent.
Impedance Specifications
ImpedanceValue
25 MHz 100 MHz
156 Ω
250
Ω
Ferrite Core
EXAMPLE Wire the control panel with cables that are as short as possible and ground
to 100
Ω or less.
EXAMPLE Keep DeviceNet communication cables as short as possible and ground to
100
Ω or less.
31522-M
13
(0.51) 29
(1.14)
30
(1.18) 33
(1.30)
Dimensions are in mm (in.).