Page D–2
DuRApulse GS4 AC Drive User Manual – 1st Ed, Rev A - 10/20/2017
Appendix D: Using GS4 AC Drives with AutomationDirect PLCs
aPPenDix D Overview
The material presented here will help you connect your GS4 drive to an ADC PLC. The concepts
and techniques used can also be applied to any 3rd party PLC.
There are two ways a PLC can control the drive; via communications or via physical inputs. The
GS4 supports either of the following communications: serial Modbus or serial BACnet (only one is
available at a time via the built-in RS-485 port). Ethernet communication is available by installing
a ModTCP option card or an EtherNet/IP option card (Only one can be installed at a time).
GS4 supports a variety of I/O on the main control board.
•
10 Sinking/sourcing DC inputs
•
2 Sinking/sourcing DC outputs
•
2 Form C relay outputs
•
3 Analog inputs (0~10V, -10~10V, 0~20 mA, 4~20 mA)
•
2 Analog outputs (0~10V, -10~10V, 4~20 mA)
•
1 Hi-speed pulse output (30V/30mA/100kHz max)
I/O can be extended by installing optional I/O cards (only one can be installed):
•
6-pt 120VAC input card (100~130 VAC)
•
4-pt DC input / 2-pt DC output card (min. 19VDC – max. 30VDC input, max. 48VDC output; inputs
and outputs are sink/source; jumper selectable)
•
6-pt Relay output card, SPST (max. 250VAC/30VDC; max. 5A resistive/2A inductive)
sinking/sourCing basiCs
GS4 DC inputs and outputs can be sinking or sourcing, depending on how they are wired. If you
understand the basics of how sinking and sourcing work, the two options can be easily applied.
•
For a detailed technical explanation of sink and source, please follow this link:
www.automationdirect.com/static/specs/sinksource.pdf
The term “sinking” means that the device “sinks” current into itself. It does not supply current.
Sinking inputs are ON when you apply voltage (and thus, current) to them. A “sinking” device
needs to have a “sourcing” device attached to it to supply current.
So, if the GS4 inputs are wired for sinking, they require the external device (FWD/STOP switch in
this example) to supply current (when closed, the external device will “source” current). Notice
the current flow represented by the red arrows. The GS4 input “sinks” the current flow.
DI6
DI7
DI8
DCM
+24V
DIC
+
FWD/STOP
REV/STOP
Multi-step 1
Multi-step 2
Multi-step 3
Multi-step 4
Field devices
are sourcing
Drive inputs
are sinking
Drive
Internals
Digital Input Common
Internal Power
Supply
N/A
N/A
N/A
N/A
REV
FWD
DI1
DI2
DI4
DI5
DI3
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