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USER MANUAL Appendices • 193
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.
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:
1/4 NEC2505
1/8 RPx3
To DMC-1748 +5V
DMC-1748 I/O
I/O
n
I/OC
n
VCC
IN
GND
OUT
IR6210
OUTC
n
PWROUT
n
1/8 RPx2
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-13X8 controller from the output circuit.
PWROUT
n
OUTC
n
Current
L
o
a
d
External
Isolated
Power
Supply
I/OC
n
V
ISO
GND
ISO