4-12 Input / Output
MN1957
www.baldormotion.com
4.3.2 Digital outputs
The digital outputs are available on connectors X4 and X11, as shown in section 4.1.1.
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.
4.3.2.1 DOUT0 - DOUT7
An external supply (typically 24 VDC) is used to power the UDN2987 output devices, as
shown in Figure 16. When an output is activated, current is sourced from the user supply
through a UDN2987 output driver.
A total of 500 mA may be sourced by DOUT0 - DOUT7, providing an average 62.5 mA
per output when all outputs are on (100% duty cycle, 24 V supply).
An individual output can provide a maximum continuous current of 350 mA, but if other
outputs are being used the total current must not exceed 500 mA.
The maximum allowable power dissipation for the UDN2987 driver is 1.5 W. If this is
exceeded the driver may shut down. To reset it, the NextMove ESB-2 must be power
cycled.
If an output is used to drive an inductive load such as a relay, a suitably rated diode must be
fitted across the relay coil, observing the correct polarity. The use of shielded cable is
recommended.
Figure 16: Digital outputs (DOUT0-7) - DOUT0 shown
4.3.2.2 DOUT8 - DOUT11
DOUT8 - DOUT11 use the same type of output circuitry as DOUT0 - DOUT7, with their own
UDN2987 output driver. Because only four of the UDN2987's eight outputs are being used,
the average current available on DOUT8 - DOUT11 is increased:
A total of 500 mA may be sourced by DOUT8 - DOUT11, providing an average 125 mA
per output when all outputs are on (100% duty cycle, 24 V supply).
An individual output can provide a maximum continuous current of 350 mA, but if other
outputs are being used the total current must not exceed 500 mA.
The maximum allowable power dissipation for the UDN2987 driver is 1.5 W. If this is
exceeded the driver may shut down. To reset it, the NextMove ESB-2 must be power
cycled.
NextMove E
S
B-2
U
S
R
V+
D
OUT
0
U
S
R GN
D
X11
1
9
10
TLP
281
+
5
V
470
R
U
DN2987
V
oltage
regulator
Mint
OUTX(0)
U
ser
supp
l
y
24V
U
ser
supp
l
y
GN
D
O
ut
p
ut
load
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
