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Operation & Service Manual
Valve islands VS18/VS26 EtherNet/IP
09/2018
Construction & Design is subject to change © 2018 Norgren GmbH
2.
Important hints
2.1 Grounding and equipotential bonding
Proper grounding and equipotential bonding are very important to protect against electromagnetic
interferences in Ethernet networks. In order to reduce potential impact, grounding of the Ethernet
cable screen should be done at both ends of every cable (i.e. at each device). Equipotential
bonding ensures that the ground potential is identical throughout the entire Ethernet network and is
essential to avoid equipotential bonding currents, which could otherwise flow through the Ethernet
cable screen.
Ground connection needs to be established using the M4 thread on the rear of the connection
module. Its location shows the red arrow on the following picture.
2.2 Intermediate supply/exhaust module (ISEM)
In cases where the channel diagnostics is activated on the valve island, the channel diagnostics
setting should be disabled at the position of each ISEM. This needs to be done in order to avoid
any misleading failure indication due to missing electronic components in the ISEM.
2.3 ATEX Note
Please refer to the corresponding ATEX installation instructions and the maximum permissible
operating conditions for valve islands in an ATEX zone.
The maximum allowed power consumption is 20W. This corresponds to 16 simultaneously
energized pilot valves. If a configuration consists of more than 16 pilot valves the user must
undertake external actions (e.g. power-limited power supplies) to make sure that the power
consumption of 20W is not exceeded.
For further details, please refer to the corresponding ATEX installation instructions or contact your
Technical Support.
