Network Communications
6
6.3 Modbus Communications
SIEPCYEUOQ2V01A Q2V Technical Manual 191
1. De-energize the drive then connect the communications cable to the PLC and the drive. The drive uses
terminal TB4 for Modbus communications.
A - Terminal A0V: Shield ground
B - Terminal RS485+:
Communication input/output (+)
C - Terminal RS485-: Communication
input/output (-)
Figure 6.2 Communications Cable Connection Terminal (TB4)
Note:
Isolate the communications wiring from the main circuit wiring and other high-power wiring Use shielded wires for the
communications wiring and connect cable sheaths to the ground terminal of the drive. Incorrect wiring procedures could
cause drive malfunction because of electrical interference.
2. Install the termination resistor on the network termination slave drive. Set DIP switch S2 to the ON position
to enable the termination resistor on the drive.
3. Energize the drive.
4. Use the drive keypad to set the necessary communications parameters H5-01 to H5-12.
• H5-01 [Mbus Address]
• H5-02 [Mbus BaudRate]
• H5-03 [Mbus Parity]
• H5-04 [Mbus Error Stop]
• H5-05 [Mbus Fault Detection Selection]
• H5-06 [Mbus Tx Wait Time]
• H5-09 [Mbus CE Detect Time]
• H5-10 [Mbus 0025H Unit Sel]
• H5-11 [Mbus ENTER Command Mode]
• H5-12 [Mbus Run Command Method Sel]
5. De-energize the drive and wait for the keypad display to turn off.
6. Energize the drive.
The drive is prepared to start communication with the PLC.
■ Set the Termination Resistor
You must enable the termination resistor on the slave terminal of the drive to use Modbus communications.
Use DIP switch S2 on the terminal block to enable and disable the built-in termination resistor.
Figure 6.3 Modbus Communication Terminal and DIP Switch S2
Use the tip of a tweezers or a jig with a tip width of 0.8 mm (0.03 in) to set the DIP switch. When you install the
drive at the end of the communication line, set DIP switch S2 to ON. Set DIP switch S2 to OFF on all other
drives.
■ Wiring Diagram for More than One Drive
This is the correct wiring when you use more than one drive with Modbus communications.
To Next Page
Loading...
Need help?
General