PM 1000268 000 00
Device handbook SIRAX MM1200
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5.4 Power supply
A marked and easily accessible current limiting switch has to be arranged in the vicinity of the
device for turning off the power supply. Fusing should be 10 Amps or less and must be rated for
the available voltage and fault current.
5.5 Modbus interface RS485
Via the optional Modbus interface measurement data may be provided for a superior system.
MASTER
+3.3 / +5V
Rx/Tx+,A
RS485 Bus
Rs
Rt
Rs
Rx/Tx-,B
GND
1)
Rt
B A G
B A G
B A G
The signal wires (A, B) have to be twisted. GND (G) can be connected via a wire or via the cable screen. In disturbed environments shielded
cables must be used. Supply resistors (Rs) have to be present in bus master (PC) interface. Stubs should be avoided when connecting the
devices. A pure daisy chain network is ideal.
You may connect up to 32 Modbus devices to the bus. A proper operation requires that all devices connected to the bus have equal
communication settings (baud rate, transmission format) and unique Modbus addresses.
The bus system is operated half duplex and may be extended to a maximum length of 1200 m without repeater.
6. Commissioning
Before commissioning you have to check if the connection data of the device match the data of
the plant.
If so, you can start to put the device into operation by switching on the power supply and the
measurement inputs.
1) One ground connection only. This is
possibly made within the master
(PC).
Rt: Termination resistors: 120 Ω each for
long cables (> approx. 10 m)
Rs: Bus supply resistors,
390 Ω each
ORDER CODE: 175019
SR No.: 15/11/0001
SIRAX MM1200
AUXILIARY: 100…250V AC/DC, 4.5VA
CLASS: 0.5
INPUT: 3PH. 440 V L - L, 5A/1A, 45...66Hz
CAT III 300V Max.
V18.10
OPTION:
!
Label version standard
ORDER CODE: 175051
SR No.: 15/11/0001
SIRAX MM1200
AUXILIARY: 100…250V AC/DC, 4.5VA
CLASS: 0.5
INPUT: 3PH. 440 V L - L, 5A/1A, 45...66Hz
CAT III 300V Max.
V18.10
OPTION: RS485 + 2x4...20mA ANA.O/P
!
Label version with RS485
