C.4 Connecting to a Network
This section explains the connection of a drive to a MEMOBUS/Modbus network and the network termination.
u
Network Cable Connection
Follow the instructions below to connect the drive to a MEMOBUS/Modbus network.
1.
With the power shut off, connect the communications cable to the drive and the master. Use the terminals shown
in the figure below for network cable connections.
S– S+ IG R– R+
S-
S+
IG
R-
R+
Send (-)
Receive (+)
Receive (-)
Shield Ground
Send (+)
Figure C.2 Serial Communications Cable Connection Terminals
Note:
Separate the communications cables from the main circuit cables and other wiring and power cables. Use shielded cables
for the communications cables, and properly shielded clamps to prevent problems with noise. When using RS-485
communications, connect S+ to R+, and S- to R- as shown in the diagram below.
2.
Check or set the terminating resistance at all slaves. Refer to
Network Termination
for Network Termination on
SI-485/J.
3.
Switch the power on.
4.
Set the parameters needed for serial communications (H5-01 through H5-07, -12, -13) using the LED operator.
5.
Shut the power off and wait until the display on the LED operator goes out completely.
6.
Turn the power back on.
7.
The drive is now ready to begin communicating with the master.
u
Wiring Diagram for Multiple Connection
Figure C.3
and
Figure C.4
explain the wiring diagrams for multiple connections using MEMOBUS/Modbus
communication.
n
RS-485 Interface
SI-485/J
OFF
S2
R+
R–
IG
S+
S–
SI-485/J
OFF
S2
R+
R–
IG
S+
S–
SI-485/J
ON
S2
R+
R–
IG
S+
S–
S+
S–
IG
R+
R–
PLC
Drive
Drive
Drive
Terminating
Register
Terminating
Register
Terminating
Register
Figure C.3 RS-485 Interface
Note:
• Turn on the DIP switch at the SI-485/J that is located at the end of the network. Turn it off at all other slaves.
• Set H5-07 to “1” when using the RS-485 interface.
C.4 Connecting to a Network
SIEP C710606 33A OYMC AC Drive – J1000 User Manual
189
C
MEMOBUS/Modbus Communications
