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47DAC OPERATING MANUAL EM-9518-B Rev.4
1.7.8 WIRING NETWORK INTERFACE
Writing/reading each measured value and configurations is available with a PC or PLC via
Modbus communication.
Transmission
Half-duplex, asynchronous, no procedure
Interface
Conforms to TIA/EIA-485-A
Max. transmission distance
500 meters
Baud rate
1200, 2400, 4800, 9600, 19200, 38400 bps
Protocol
Modbus-RTU
Node address
1 to 247
Max. number of nodes
31 (except the master)
Media
Shielded twisted-pair cable (CPEV-S 0.9 dia.)
IMPORTANT
• Internal terminating resistor is used when the device is at the end of a transmission line.
• Install shield cables to all sections and ground them at single point for noise protection.
• Connect in a daisy chain.
• Be sure to confirm the polarity in wiring.
• Use duplex or triplex shield cables.
I/O options code: 4, 7, 8
11
12
13
14
T1
T3
T4
T2
Term.
Resist.
To other Modbus devices
Ground
(resistance
100 ohms or less)
+
–
■
COMMUNICATION CABLE CONNECTIONS
R2K-1
T1
T2
T3
T4
47Dx
T1
T2
T3
T4
T1
T2
T3
T4
47Dx
CONNECTOR
RS-232-C
RS-485
*
1
*
1
*
1 Internal terminating resistor is used when the device is at the end of a transmission line.
*
2 Install shield cables to all sections and ground them at single point.
*
2
FG
RS-485