Galil DMC-2X00 user manual High Power Digital Outputs, Figure A-10

	Sinking			Sourcing
I/OCn		+5V	I/OCn		GND
I/On		NPN	I/On		PNP
	Current	output		Current	output

Figure A-10

Whether connected in a sinking or sourcing circuit, only two connections are needed in each case. When the NPN output is 5 volts, then no current flows and the input reads 1. When the NPN output goes to 0 volts, then it sinks current and the input reads 0. The PNP output works in a similar fashion, but the voltages are reversed i.e. 5 volts on the PNP output sources current into the digital input and the input reads 0. As before, the 5 volt is an example, the I/OC can accept between 4-28 volts DC.

Note that the current through the digital input should be kept below 3 mA in order to minimize the power dissipated in the resistor pack. This will help prevent circuit failures. The resistor pack RPx4 is standard 1.5k ohm which is suitable for power supply voltages up to 5.5 VDC. However, use of 24 VDC for example would require a higher resistance such as a 10k ohm resistor pack.

*The 1-4 axis models of the DMC-2x00 all work with the IOM-1964, all have identical extended I/O features.

High Power Digital Outputs

The first two banks on the IOM-1964, banks 0 and 1, have high current output drive capability. The IOM-1964 is shipped with banks 0 and 1 configured as outputs. Each output can drive up to 500mA of continuous current. Configuring a bank of I/O as outputs is done by inserting the optical isolator NEC2505 IC’s into the Ux1 and Ux2 sockets. The digital input IC’s Ux3 and Ux4 are removed. The resistor packs RPx2 and RPx3 are inserted, and the input resistor pack RPx4 is removed.

Each bank of eight outputs shares one I/OC connection, which is connected to a DC power supply between 4 and 28 VDC. A 10k ohm resistor pack should be used for RPx3. Here is a circuit diagram:

To DMC-2x40 +5V

1/8 RPx2

1/4 NEC2505

I/OCn

DMC-2x40 I/O

1/8 RPx3

	IR6210
	VCC
IN	OUT	PWROUTn
	GND
		I/On

OUTCn

Figure A-11

The load is connected between the power output and output common. The I/O connection is for test purposes, and would not normally be connected. An external power supply is connected to the I/OC and OUTC terminals, which isolates the circuitry of the DMC-2x40 controller from the output circuit.

DMC-2X00 Appendices y 179