SIGRIST FireGuard 2 Integral, Инструкция по эксплуатации, Страница: 35 / 102

Electrical installation Instruction Manual FireGuard 2
13542E/4 35
Pos : 76 /F eldbussc hnit tst elle und Zusat z modul e/M odbus RTU I nst allati on mit SI PORT 2 @ 4\ mod_1441273954580_20.doc x @ 21507 @ 2 @ 1
5.6 Modbus RTU with repeater: Overview and installation

To connect to the Modbus RTU with repeater, a Modbus module must be integrated in
the SIPORT 2.

In the Digi.interf. \ General menu, the Module type must be set to Modbus and the
Module location to SIPORT 2 .

To be able to work with the Modbus, the bus parameters in the Digi. interf. \ Modbus
menu must be correctly set. If the associated parameters are changed, the function be-
comes effective only after a restart.

If the photometer is used as a terminal device, DIL switch S2/1 must be switched ON on
the connection module (Figure 14, pos. 3).

The addressing of the Modbus RTU interface is described in Section 8.7.

Either a SICON M control unit or in-house control unit can be used as the Modbus mas-
ter.

A twisted pair, shielded cable (SF/UTP) should be used. Characteristic impedance 120
±20 Ohm, capacitance < 60 pF/m.

In order to prevent equalizing currents on the shielding, the shielding is grounded via a
capacitor on the insulated connection.
Figure 14: Overview of the Modbus RTU module in the SIPORT 2

Fieldbus interface (connection
print) for Modbus RTU with re-
peater

Connector for SIPORT 2 print

DIL switch for matching resistors.
Switches (1 and 2) must be
ON

Modbus RTU terminals. Galvanically
isolated. (Cable cross-section: 0.08 ..
1.5 mm
2
)

Modbus RTU terminals. Connected
to ground potential. (Cable cross-
section: 0.08 .. 1.5 mm
2
)