The drive can perform serial communication by using a programmable controller (PLC) and
MODBUS
protocol. MODBUS is composed of one master PLC and 1 to 31 (maximum)
slave units (GPD 506/P5 drives). In serial communication between the master and slaves,
the master always starts transmission and the slaves respond to it.
The master communicates with one slave at a time. Address numbers are assigned to each
slave in advance, and the master specifies an address to communicate with. The slave
which receives the command from the master executes the function, and then responds to
the master.
A. Communication Specifications
• Interface : RS-232C (standard); RS-485, RS-422 (option -
requires communication interface card CM086)
• Synchronization : Asynchronous
• Transmission parameters : Baud rate — Selectable from 2400, 4800,
9600 BPS (n105 )
Data length — Fixed to 8 bits
Parity — Parity / no parity, even / odd
selectable (n106)
Stop bit — Fixed to 1 bit
• Protocol : MODBUS
• Maximum number to units
to be connected : 31 units (when RS-485 is used)
B. Sending/Receiving Data
Data that can be sent and received are run/stop commands, frequency reference, fault
reset, drive status, and setting and reading of parameters.
n002 : Operation Mode Selection (Oper Mode Select)
Select the run command and frequency reference input method in n002. To provide
a run command and/or frequency reference by communication, set this parameter to
one of the last five settings. Monitoring of run status, parameter setting/reading,
fault reset and multi-function input command from the PLC are enabled. The multi-
function input command is OR’ed with the command input from control circuit
terminals S2-S6.
5-22
5.16 MODBUS CONTROL
Description
LED Setting LCD Setting Sequence Reference
0 SEQ=OPR REF=OPR Digital Operator Digital Operator
1 SEQ=TRM REF=OPR External Terminals Digital Operator
2 SEQ=OPR REF=TRM Digital Operator External Terminals
3 SEQ=TRM REF=TRM** External Terminals External Terminals
4 SEQ=OPR REF=COM Digital Operator Serial Communications
5 SEQ=TRM REF=COM External Terminals Serial Communications
6 SEQ=COM REF=COM Serial Communications Serial Communications
7 SEQ=COM REF=OPR Serial Communications Digital Operator
8 SEQ=COM REF=TRM Serial Communications External Terminals
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