Page 8–4
DuRApulse GS4 AC Drive User Manual – 1st Ed, Rev A - 10/20/2017
Chapter 8: GSLogic Introduction
noteS on uSinG GSloGiC, tHe GS4 PlC, anD tHe GS4 Drive
1) The GS4 PLC default node address is 2. The PLC node address can be changed in parameter
P9.37, but this address cannot be the same as the GS4 drive node address of P9.00, which
has a default node of 1. If multiple GS4 drives and PLCs will be connected to a third-party
Modbus Master, be sure to avoid duplicate node numbers.
2) The GS4 drive provides two RJ45 ports and one set of terminals (SG+ & SG-) for serial RS-485
communications, internally wired in parallel, that can be used to download PLC programs
(see figure below).
Channel 1 (RJ45 for keypad communication only) has a fixed communications format, and
can only be used with the supplied keypad.
Channel 2 is the serial interface to Modbus-capable PLCs, HMIs, and PCs for programming
and reading/writing data. Channel 2 can be accessed via the built-in RJ45 connectors (ideal
for connecting multiple drives together with standard RJ45 cables) or via the SG+, SG-, and
SGND terminals. Channel 2 has a default communications setting of 9600, 8, N, 1 Modbus
RTU (two RJ45 ports and one set of terminals for RS-485). If communication settings in P9.01
and P9.02 are changed, this also changes the PLC comm settings. The Drive node and PLC
node will always have the same serial baud rate and protocol. The communication settings
are the same for the PLC and Drive communications, programming, and configurations.
P9.01 and P9.02 are used to set up the serial communication rate and protocol.
(keypad only)
reserved
3) A client can simultaneously access data from the GS4 drive and the internal PLC. This is
performed by using the two node numbers. For instance, if the GS4 drive node is 1 and the
internal PLC node is 2, then the client command will be: 01 (node) 03 (read) 0400 (address)
0001 (1 data item), indicating that it must read the data from the GS4 drive parameter P4.00.
Or the client will select the PLC: 02 (node) 02 (read) 0800 (address) 0001 (1 data item),
indicating that it must read the data from the internal PLC which is the address to internal
bit M0.
4) The PLC program will be disabled from running when uploading/downloading programs.
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