Specifications

Chapter 13 - Digital Input/Output Module (DIO)
144 Adept MV Controller User’s Guide, Rev C
Testing Outputs and Fuses
Like many solid-state I/O systems, when an output is off, a small leakage current will try
to flow out of the output. This will raise the potential of the output to the power supply
voltage level if there is no load. With a load connected, the output will function normally.
However, if you need to test the output with a voltmeter with a load disconnected, you
will get a false reading. The test signal provides a bias which can be used as a pulldown
resistor for system-level debugging. When this is connected to an output, the output will
assume the ground potential when it is off.
The test signal can also be used to test the state of the power fuse for that particular group.
If the resistance between the test and ground pins is less than 10 K ¾, then the fuse is OK.
If the reading is greater than 10K ¾ then the fuse is blown and needs to be replaced. Call
Adept Customer Service for information on replacement.
Output Power Supply Voltage Jumpers
Each group of signals (1 through 4) has a jumper associated with it to select the power
supply voltage range. The two ranges are 15 to 30 VDC and 10 to 15 VDC. The jumpers are
located on the DIO PC board. Each jumper has a clip that can be placed in either position
A or position B. See the table below for the jumper numbers for each group.
The DIO modules are normally shipped with the ranges set to 15 to 30 VDC. You should
verify this before connecting I/O lines and equipment for the first time.
CAUTION:
The power supply voltage should not go below the selected
range because this could cause the output transistors to operate in the
linear state and dissipate excessive power. Likewise, the power supply
voltage should not exceed the selected range because this could blow the
fuse for that group.
There is no requirement to provide specific power sequencing between the output power
supplies and the VME power supply. The design of the output section is such that the
outputs will not turn on during module power up.
Table 13-2. DIO Output Voltage Range Settings
Signal
Group
Number
Jumper
Number
Voltage
output in
Position A
Voltage
output in
Position B
1 J4 15 to 30 V 10 to 15 V
2 J3 15 to 30 V 10 to 15 V
3 J5 15 to 30 V 10 to 15 V
4 J6 15 to 30 V 10 to 15 V
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