2680A/2686A
Users Manual
A-28
Digital Input/Output Module
The following specifications apply to the DIO Module. The module contains
digital inputs, digital open collector outputs, relay contacts, and totalizer.
XW
Warning
The DIO module is rated as a CAT I device.
Digital Input/Output Specifications
Table specifications provides a summary of the Digital I/O specifications for the
10 Digital I/O lines (0 to 19). Digital I/O is located on the Output Module Digital
connector, terminals 0 to 19, and GND.
Table A-37. DIGITAL I/O Specification
Specification Characteristic
Maximum Input Voltage
30 V
Minimum Input Voltage
-4 V
Isolation
None (dc coupled)
Threshold 1.4
V
Hysteresis 500
mV
Output Voltage - TTL Logical Zero
0.8 V maximum for an Iout of -1.0 mA (1 LSTTL
load)
Output Voltage - TTL Logical One
3.8 V minimum for an Iout of 0.05 mA (1 LSTTL
load)
Output Voltage - Non-TTL Load Zero
1.8 V maximum for an Iout of -20 mA
3.25 V maximum for an Iout of -50 mA
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