7.2
Rules for connecting S5 expansion units
Introduction
When you connect S5 expansion units to an S7-400 via the IM 463-2, there are rules to observe
with regard to cable length, maximum expansion, use of a terminating connector and
permissible potential differences.
Cable length
The maximum cable length per IM 463-2 from the CR of the S7-400 to the last S5 expansion
unit is 600 m. You set the actual cable length at the IM 463-2.
Maximum configuration
You can use up to four IM 463-2s in one S7-400 CR.
At each IM 463-2 interface (C1 and C2), you can connect up to four S5 expansion units in a
distributed configuration.
You can connect further EUs centrally to the EUs connected in the distributed configuration.
Addressing of the S5 modules
All S5 address areas are available (P, Q, IM3, IM4)
Note
Note that every S5 address can only be used once, even across different lines.
Terminator
You must terminate the IM 314 of the last EU in each line with the 6ES5760-1AA11 terminating
connector.
Permissible potential differences
For the safe functioning of the distributed configuration, you must ensure that the potential
difference between two devices is not more than 7 V. Use an equipotential bonding conductor.
See also
Operator controls and indicators (Page 348)
S5 interface IM 463-2
7.2 Rules for connecting S5 expansion units
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08
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