20 SM-Applications Modules & Motion Processors User Guide
Issue Number: 4
3.8 Digital I/O Connections
The SM-Applications, SM-Applications Plus and Digitax ST Plus are equipped with 2
digital inputs, known as DIGIN0 and DIGIN1, and 2 digital outputs, known as DIGOUT0
and DIGOUT1. These inputs and outputs can be read/controlled from the user program
loaded into the SM-Applications Modules & Motion Processors .
The digital outputs are a positive logic arrangement such that they are at +24V when
active and will supply up to 20 mA of current. When inactive they are effectively floating.
The digital outputs are protected against short-circuit or overload. The trip threshold is
20 mA, and if tripped both outputs will be deactivated.
The digital I/O are controlled using menu 86 - refer to section 5.6 Menu 86 - Digital I/O
Parameters on page 46.
3.9 Port Isolation
The digital input/output ports are connected to the main drive control circuits.
The CTNet and EIA-RS485 ports have supplementary insulation from the input/output
ports, giving overall double insulation from the power circuit.
They have simple separation (functional insulation) from each other.
0V
DIGIN0
DIGIN1
DIGOUT1
DIGOUT0
139121110
The I/O circuits are isolated from the power circuits by basic insulation (single insulation)
only. The installer must ensure that external control circuits are insulated from human
contact by at least one layer of insulation (supplementary insulation) rated for the AC
supply voltage
To maintain the double insulation status of the data ports:
• All circuits to which either port is connected must have protective separation (i.e.
double insulation or single insulation with grounding)
• All circuits to which the drive control circuits are connected must have at least basic
insulation from live parts.
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