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4-8 Input / Output MN1928
4.4.2 Digital outputs
The digital outputs are available across a range of pins, as shown in section 4.2.1.
H 12 general purpose digital outputs.
H One error output, configurable as a general purpose digital output.
H Update frequency: Immediate.
There are 12 general purpose digital outputs. 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.
4.4.2.1 DOUT0 - DOUT7
Outputs DOUT0 - DOUT7 are 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 DOUT0 - DOUT7 must not exceed this limit. The maximum current limit for an individual
output is 500mA if only one output is in use, reducing to 150mA if all outputs are in use. These
limits are for a 100% duty cycle.
If the outputs are driving inductive loads such as relays, connect the OUT COM connection to
the output’s power supply, as shown in Figure 8. This will connect internal clamp diodes on all
outputs.
DOUT0
NextMove ES
ULN2803
MintMT
OUTX.0
74AHCT244
DGND
GND
Load
supply
24V
Load
supply
GND
Output
Load
OUT COM
Connect to supply if
using i nductive loads
c6
a3
a4
Figure 8 - Digital outputs (DOUT0-7) - DOUT0 shown