CAUTION!
The process supply voltage must be included in the earthing concept (e. g.
earthing of the minus pole).
The supply voltage 24 VDC for the module's electronic circuitry comes from the ZP/UP termi-
nals.
The module provides several diagnosis functions
Ä
Chapter 1.7.2.3.11 “Diagnosis”
on page 820).
WARNING!
Removal/Insertion under power
The devices are not designed for removal or insertion under power. Because of
unforeseeable consequences, it is not allowed to plug or unplug devices with
the power being ON.
Make sure that all voltage sources (supply and process voltage) are switched
off before you
– connect or disconnect any signal or terminal block
– remove, mount or replace a module.
Disconnecting any powered devices while energized in a hazardous location
could result in an electric arc, which could create a flammable ignition resulting
in fire or explosion.
Make sure that power is removed and that the area has been thoroughly
checked to ensure that flammable materials are not present prior to proceeding.
The devices must not be opened when in operation. The same applies to the
network interfaces.
CAUTION!
Risk of influences to the connected sensors!
Some sensors may be influenced by the deactivated module outputs of DC551-
CS31.
Connect a 470 W / 1 W resistor in series to inputs C16/C17 if using them as
Fast Counter inputs to safely avoid any influences.
1.7.2.3.4 CS31 Bus Connections
The CS31 bus is connected through the Terminal Unit with the terminals 1.0 to 1.7. The end-of-
line resistor can also be activated by using external wire jumpers.
The following figure shows a CS31 bus module at the end of the CS31 bus (end-of-line resistor
activated).
Communication Interface Modules (S500) > CS31
2019/04/173ADR010121, 13, en_US814
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