Micromod MOD: Remote I/O Modules for use with 2020N Remote Manual de usuario descargar pdf (Pagina 15)

Remote I/O Modules

ELECTRICAL CONNECTIONS

3.4 REMOTE I/O INTERFACE BUS CONNECTIONS

The remote I/O Interface (CS 31) bus is a shield twisted pair RS485 connected as described

below. One 2020N Remote I/O Interface module is required for each remote I/O network.

REMOTE I/O INTERFACE RS485 SERIAL NETWORK

Bus Master 2020N Remote I/O Interface Module (end of bus)

Bus Slaves Remote I/O Digital Modules

Maximum Length 500 meters (1600 feet)

Baud Rate 187.5K

Number of Addresses 32 (31 slaves + 1 RIO master at address 0). Star connection

of the bus is forbidden!

Termination 120 Ω, 1/4 Watt resistor required across the two conductors

at each end of the cable (2 shipped with RIO module)

Shield Required over 50 meters (160 feet). The shield of the bus

must be connected to the earth near the master. The shield

is connected to the earth through a capacitor 1 nF class Y.

Isolation The bus is opto-isolated from all units.

REMOTE I/O INTERFACE CABLE

Indoor Beldon #9182

Indoor Plenum Beldon #89182

Underground Beldon #9815 twisted twinax

Outdoors above ground NOT recommended

Wiring See connection guidelines

When noisy elements are in the area of the cabinet, it is better to connect the bus' shield to

the ground via a capacitor 1 nF class Y directly at the access of the cabinet according the

following diagram.

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 41 42

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Micromod MOD: Remote I/O Modules for use with 2020N Remote Manual de usuario Pagina 15