Generally, analog signals must be laid in shielded cables. The cable shields
must be earthed at both sides of the cables. In order to avoid unacceptable
potential differences between different parts of the installation, low resistance
equipotential bonding conductors must be laid.
Only for simple applications (low electromagnetic disturbances, no high require-
ment on precision), the shielding can also be omitted.
The following figures show the electrical connection of the Ethernet bus module CI521-
MODTCP.
Fig. 173: Connection of the bus module CI521-MODTCP
Further information is provided in the System Technology chapter CI52x-MODTCP.
Connection of the Digital Inputs
The following figure shows the electrical connection of the digital input DI0. Proceed with the
digital inputs DI1 to DI7 in the same way.
Communication Interface Modules (S500) > Modbus
2019/04/17 3ADR010121, 13, en_US 883
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