Baldor iMN1921 installation manual Digital outputs, Digital output DOUT0 shown

4.5.2 Digital outputs

The digital outputs are available across a range of connectors, as shown in section 4.1.1.

H16 general purpose digital outputs

HUpdate 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.

NextMove ST
	ULN2803
MintMT	2
	74AHCT244
OUTX.0
	10
GND	11

Output

Load

DOUT0

OUT COM0

DGND

Load supply 24V

Connect OUT COM0 to supply if using inductive loads

Load supply

GND

Figure 13 - Digital output - DOUT0 shown

MN1921 Input / Output 4-13