MR ETOS TD, Руководство по эксплуатации

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6 Mounting
Maschinenfabrik Reinhausen GmbH 2020 57 4453918/14 EN ETOS
®
TD
D-SUB 9-pole plug connection
Only use 9-pole D-SUB plugs with the following characteristics:
▪ Plug housing is metallic or metal-plated
▪ Cable shielding is connected with the plug using one of the two following
variants:
– Shielding is screwed down with traction relief.
– Shielding is soldered with plug housing.
Figure 39: Example of a soldered shielding on a plug housing
6.4 Notes on connecting to the MR sensor bus
The optionally available MR sensor bus function lets you connect digital and
analog sensors to the device over Modbus RTU. The MR sensor bus sup-
ports the connection of up to 31 sensors (Modbus slaves). The ISM® device
operates as the Modbus master.
Ensure that no other Modbus master is connected over the MR sensor bus.
Assign a unique Modbus address to each sensor you are connecting over
MR sensor bus. The MR sensor bus may experience errors if multiple sen-
sors are using the same Modbus address.
Observe the following notes for connecting the sensors:
▪ NOTICE! Damage to the device or sensor. Connect all of the sensors to
the potential equalization rail to avoid circulating currents over the MR
sensor bus.
▪ The MR sensor bus uses Modbus in a 2-wire configuration (2W). The 4-
wire configuration (4W) is not supported.
▪ You must connect the sensors via a shielded line with 3 conductors (D0,
D1, Common). The data lines (D0, D1) must be in twisted pairs. Note the
cable recommendation.
▪ Stub lines from the bus node to the respective device must be shorter
than 20 m.