Features
Up to 96 differential channels per full rack mainframe

Constantly monitor input signals for fault conditions

Flexible configurations for detecting edges, out-of-bounds conditions and measuring pulse widths

Inputs can be masked, inverted and combined to produce interrupts

Programmable debounce circuitry prevents erroneous readings

±10 V and ±100 V input ranges

On-board memory stores events with IEEE 1588 timestamps

Synchronize reading of input states with other scanned analog channels
EX1200-7416 Datasheet
16 Channel Comparator/Detector
Overview
The EX1266-7416 has 16 true differential channels of analog comparator input, that can be selected to provide an interrupt to the EX1200 system, when the input falls outside the software programmed bounds, independent of the scan list operation. The EX1200-7416 is an ideal device in go/no-go testing where a device fails if the voltage outputs exceed a threshold or window, or even in control applications if a device or test needs to be shut down if a voltage level is exceeded. Using an analog comparator/interrupter in certain applications, as opposed to a traditional scanning approach of the EX1200 series considerably improves the overall response time of the system, providing the ability to ‘constantly monitor’ signals of interest for fault conditions.

The inputs are independently software programmable, permitting the user to vary input thresholds per channel. Each input signal is also digitally debounced for a programmed time ranging from 1 μs to 500 ms, preventing input signal noise from causing undesired interrupts. The threshold polarity can be programmed to detect either a rising or falling edge or can be masked to prevent unused channels from causing interrupts.

All of the enabled inputs are OR’d together to produce a single interrupt signal. Input can be combined via math functions to create virtual channels when multiple conditions must be satisfied before an event is recorded. On-board memory stores events with precise IEEE-1588 timestamps. The interrupt signal can be routed through the front panel connector for distribution to other devices in the test system for absolute deterministic communication.

There are three modes of operation that satisfy a wide range of applications. In normal mode, any channel crossing a threshold with the programmed polarity will cause an event to be latched into memory. Window mode automatically parallels two adjacent input channels and is used when an input signal is expected to be within upper and lower bounds. The pulse mode provides a means for measuring the pulse width of input signals by automatically changing the threshold polarity at each crossing.

The EX1200-7416, as part of the EX1200 family of switching and I/O, can be combined with up to five other modules and a DMM to form a high-density test subsystem in a 1U footrpint.
Specifications
Number of Channels 16 differential or SE
Input Ranges ±10 V, ±100 V, (Special ranges available)
Input Threshold ±10 V range with 78 mV resolution (8-bit), per channel
±100 V range with 780 mV resolution (8-bit), per channel
Input Type Differential, may be configured for single-ended by grounding the negative input.
Input Impedance 200 kΩ differential
100 kΩ single-ended
Input Polarity Rising or falling edge, per channel
Modes Normal (Edge Detect)
Window (upper/lower bounds)
Pulse (Positive/Negative Polarity)
Debounce Time 1 μs to 500 ms
Memory 128k events
Timestamp IEEE-1588
Math Functions AND/OR
Input Impedance > 1 MOhm
Connector 44p HD Dsub

Ordering Information
EX1200-7416 16 channel Comparator/Event Detector
27-0390-044 44p HD DSub mating connector, backshell and pins, crimp style
70-0363-502 44p HD DSub mating connector and backshell, with 3ft unterminated 22 AWG wire
70-0297-001 Crimp tooling, includes handle and positioner, 22 AWG