www.baldormotion.com
Input / Output 4-11
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 or 8 general purpose digital outputs (model dependent).
H
One error output, configurable as a general purpose digital output.
H
Update frequency: Immediate.
On models NES002-501 and NES002-502 there are 12 general purpose digital outputs.
On model NES002-503 there are 8 general purpose digital outputs, since DOUT8 - DOUT11
are reassigned to provide the STEP4/5 and DIR4/5 axis output signals.
A digital output can be configured in Mint 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 Mint
WorkBench (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 24 VDC), 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 2 W at 25
°
C. The total output
requirements of DOUT0 - DOUT7 must not exceed this limit. The maximum current limit for an
individual output is 500 mA if only one output is in use, reducing to 150 mA 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 10. This will connect internal clamp diodes on
all outputs.
DOUT0
NextMove ES
ULN2803
Mint
OUTX(0)
74AHCT244
DGND
GND
Load
supply
24 V
Load
supply
GND
Output
Load
OUT COM
C
onnec
t
to
suppl
y
if
us
ing
induc
tiv
e
loads
c6
a3
a4
Figure 10 - Digital outputs (DOUT0-7) - DOUT0 shown
Servo Systems Co. • 115 Main Road • P.O. Box 97 • Montville, NJ,
07045-0097 • (973) 335-1007 • Toll Free: (800) 922-1103
Fax: (973) 335-1661 • www.servosystems.com
