4
3.3 Response interval of Slave
Period of response
approx. 50ms
Request from
Master (query)
Request from
Master (query)
Response from Slave
(Response)
Note:
•
Slave will reply approx. 50ms after receiving data from Master regardless of the baud rate.
< Communication example >
Power ON
10 seconds
10 seconds
1 min
…
OFF command
OFF
Master
Slave
ON command
ON
Monitor
Monitor
3 Communication timing
4 Connecting Modbus input
Connect Modbus input to TB63. (See <Fig. 4.1> and <Photo 4.1>)
Besides, See <Table 4.1> regarding RS-485 cable specifications.
Connect only one side of the shield wire to the FG terminal.
< Fig. 4.1 >
PAC-(S)IF013B-E
A
120
Ω
A
B
B
SG
SG
FG
Shield
Shield
Shield
Master device
120
Ω
A
A
B
B
SG
SG
PAC-(S)IF013B-E
Master device
120
Ω
FG
FG
A
B
SG
FG
PAC-(S)IF013B-E
120
Ω
< Table 4.1 : Cable specifications >
Item
Description
Cable type
Shielded cable
Number of pairs
2P
Conductor resistance (20°C)
88.0 Ω/km or less
Insulation resistance
10000MΩ · km or more
Dielectric withstand voltage
500VDC, 1 minute
Electrostatic capacitance (1 kHz)
60nF/km or less by an average
Characteristic impedance (100 kHz)
110±10Ω
Recommended conductor size
0.5 to 1.25 mm
2
Length
Max. 1200m
Note :
•Termination resistor is NOT mounted in the circuit on
PAC-IF013B-E/PAC-SIF013B-E. Therefore, if you
install PAC-IF013B-E/PAC-SIF013B-E at line end,
connect a termination resistor.
FG
TB63 (A, B, SG)
< Photo 4.1 >
