Technical Data; Commissioning Process - Hitachi Abb Rvt Installation Und Betriebsanleitung

3D view
Controller optical
transceiver

4.4. Technical data

– Operating ambient temperature: -20 to +70 °C
– Number of nodes (Tx drive): 32 max
– Rx loading: receiver impedance is 1 unit load per RS485 Modbus adapter
– Size of the Link: 247 stations including repeaters (31 stations and 1 repeater per segment)
– Medium: Shielded, twisted pair RS485 cable (Belden 9841 typical)
– Maximum Bus Length: 1200 m
– Topology: Multi-drop
– Serial Communication Type: Asynchronous, 2 wires half Duplex
– Baud rate: 110, 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600 bauds selectable by the user (can be
adjusted through the controller menus)
– Termination resistor: built in, selectable by a switch. 120 ohms resistor is needed at both end of the line and must
be switched or not depending on the location in the Modbus network topology.
– Transient voltage suppressors
– Screwed terminals on the RS485 side
– TX – RX Led indication for easy debugging and troubleshooting
– Slew-Rate Limited for Error-Free Data Transmission (minimizing EMI and reducing reflections caused by improp-
erly terminated cables)
– Drivers are short-circuit current limited
– The receiver input has a fail-safe feature in case of broken connection
– Compatible Devices: Any Modbus device capable of Modbus communication as a master.
– Speed reply time: better than 5 ms @ 57600 bauds
– Max data packet: Any complete table provided in the Modbus data table

4.5. Commissioning process

To install the RS485 Modbus adapter, follow the hereafter commissioning process.
– Disconnect power supply from the controller
STATUS
Approved
Controller power
supply connector
SECURITY LEVEL
Public
3D view inserted in back plate
DOCUMENT ID
9AKK107045A9895
RS 48 5 A DAPTE R
REV. LANG. PAGE
E en 10/21
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