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Input / Output 4-13MN1921
4.5.2 Digital outputs
The digital outputs are available across a range of connectors, as shown in section 4.1.1.
H 16 general purpose digital outputs
H Update frequency: Immediate
There are 16 general purpose digital outputs, arranged in two groups; DOUT0-DOUT7 and
DOUT8-DOUT15. Each group is driven by a ULN2803 device. The outputs are designed to
sink current from an external supply (typically 24VDC), but have no overcurrent or short circuit
protection. When an output is activated, it is grounded through the ULN2803.
The ULN2803 has a maximum power dissipation of 2W at 25°C. The total output requirements
of each group must not exceed this limit. The maximum current limit for any output within a
group is 500mA if only one output is in use, reducing to 150mA if all outputs in the group are in
use. These limits are for a 100% duty cycle.
If the outputs are driving inductive loads such as relays, connect the group’s OUT COMx
connection to the output’s power supply, as shown in Figure 13. This will connect internal
clamp diodes on all outputs in the group.
An output can be configured in MintMT as a general purpose output, a drive enable output or a
global error output. Outputs can be shared between axes and can be configured using
WorkBench v5 (or the OUTPUTACTIVELEVEL keyword) to determine their active level.
DOUT0
NextMoveST
ULN2803
MintMT
OUTX.0
74AHCT244
DGND
GND
Load
supply
24V
Load
supply
GND
Output
Load
OUT COM0
Connect OUT COM0 to
supply if using inductive loads
10
2
11
Figure 13 - Digital output - DOUT0 shown