4 | Installation and commissioning
42
D-ISC 100 x xx2
The connecting cables to the sensors (Sa and Sb) are pre-wired
at the terminals of the D‑ISC100 and the D−TB100. There are
connectors on the other ends of the cables. The sensors are
connected exclusively via this connector. The operator does not
need to carry out any local wiring work on the terminals!
Communication between the D‑ISC100 and the sensors is per-
formed via a serial Modbus connection.
In this example, the D‑ISC100 (Da) acts as the Master at Mod-
bus B, and sensors Sa and Sb act as Slaves. The bus must be
terminated at each end. This termination can be switched on and
off in the individual devices (see relevant manual).
In this example, the D‑ISC100 (Da) also serves as an interface
between the sensor system and the PLC [}204]. The PLC can be
connected via analogue and digital I/O [}203]s, Modbus RTU
[}204] or Modbus TCP [}204]. Optional expansion modules may
be required here.
The terminals are defined in Section 4.2.4 Bus connection [}36],
together with further details on the connection of the data cable.
The connections X2 and X6 can be guided out of the housing via
an M12 connector. Therefore, bus wiring via pre-assembled bus
cables can be used as an alternative to direct wiring.
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