Manual
| System Manual
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3.2.2 Internal System Connection Terminations
A terminal resistance must be installed on each cord of the internal system connec-
tion.
Compact modules have an integrated terminal resistance. If the last I/O module in a cord is a compact
module, it is not necessary to install a supplementary terminal resistance. If the last I/O module is an
expansion module, the expansion interface of the internal system connection must always be fitted
with a terminating resistor. Unused connections of the bus node must always be fitted with a terminat-
ing resistor. Unused slots of the modules have to be fitted with blind plugs, in order to reach IP67 pro-
tection. The following illustration shows by means of a configuration example where the terminating
resistors must be installed.
Fig. 5: IP67 plugs
If a slot is not used:
Terminating resistor from the fieldbus at
the bus node
Terminating Resistor of the
Internal system connection
Locking cap of the 7/8" Power cable
Locking cap in the
I/O area
For the relevant locking caps see Chapter System Components > Accessories
