Page 7.2
32-CHANNEL DIGITAL I/O MODULE 40-412
pickering
SECTION 7 - MAINTENANCE INFORMATION
High Side
Driver
Low Side
Driver
Vext
GND
En
En
Output Circuit
Input Circuit
32
Ref1
Ref2
40-412
Voltage
Source
+
–
PSU
32
1
1
3
NOTE: All inputs and outputs are wired to a single point
VERIFICATION PROCEDURE
The 40-412 contains no adjustable parts, performance is guaranteed by the design without adjustment.
he
does not re uire routine verification owever some users ma need to have a routine rocedure for
verification im osed on a s stem for other reasons so the following is a rocedure which demonstrates that the
40-412 is working correctly. It tests that the output drives are operating and that the digital inputs can read back their
status.
Required Test Equipment
The following is required to verify the 40-412:
A voltage source capable of being set to 0V and 20V.
fi ture which can e created from a
wa t e mating connector or a Pickering Interfaces accessor
such as 40-960-078 or 40-965-078.
Figure 7.1 - 32-Channel Digital I/O Module - Verification Test Set-up
he user should create a test fi ture as shown in igure
The power supply should be connected to the 40-412 ground and Vext pins, ensuring the positive terminal is
connected to Vext.
NOTE: The power supply should be set with a 100mA current limit.
wo k resistors and a
k resistor should e wired as shown so the form a
otential divider he
k
resistor com ensates a ro imatel for the in ut im edance of the digital in uts
channels
All 32 channel drivers are connected to the potential divider mid-point. All 32 digital inputs are connected to the
potential divider mid-point.
