ISM-TRM-ISO-IN
24 Line, Isolated Input
Signal Conditioning Module
Features
• Small form factor industrial I/O termination board
• 24 optically isolated and debounced inputs
• Input voltage from 5 to 30 volts AC or DC
• 2500 Volt isolation of the signals
• Custom configurations with optically isolated outputs
and/or relays available for OEM-specific applications
• Convenient and reliable 3.5mm pitch, pluggable
quick disconnect terminal block connectors for
field wiring
• Ribbon cabling directly compatible with WinSystems’
single board computers and individual I/O modules
• Industry standard 50-pin keyed IDC connector
• Single +5V power supply
Product Description
• Small 3.6 x 3.8 inches (90 x 96mm) size allows the
WinSystems’ ISM-TRM-ISO-IN provides 24 lines of optically
isolated and digitally debounced inputs to provide easy
connections and signal conditioning from field wiring. The
board is needed for applications requiring signal isolation
between an embedded computer and monitoring points.
Isolation creates a barrier which will eliminate common
mode voltage and prevents ground loops plus provides
safety for industrial applications.
module to be put in a stack or to standalone
• Operates from -40°C to +85°C
• RoHS compliant board
To interface with field wiring, the boards use a 3.5mm
pitch pluggable connector to insure a reliable connection with easy removal and insertion. A minimum of three
micro-inches of gold plating is on all the connector mating
surfaces. The connectors are located on three edges of
the board and are grouped for 8-lines per edge. There are
two signal lines associated for each bit since isolation is
provided from the host interface.
These boards will work with small form factor embedded
PC and I/O modules that use WinSystems’ WS16C48compatible digital I/O controller connector pinout. It will
also work with other manufacturer’s products as well.
ISM-TRM-ISO-IN Block Diagram
All these boards have the same physical dimensions and
mounting holes as the 3.6 x 3.8 inches (90 x 96mm) Industry Standard Module (ISM). This allows ease of mechanical
layout and packaging while offering excellent configuration flexibility.
WinSystems | 715 Stadium Drive, Arlington, TX 76011 USA | Tel 817-274-7553 | [email protected] | www.WinSystems.com
ISM-TRM-ISO-IN - 24 Channel Opto-Isolated Input Module
Isolated Input - isolated input pair is wired to a photocoupler. Both the anode and cathode of the photocoupler
LED are wired to a terminal block for jumper selection by
the user. This gives the user the configuration flexibility of
driving from either an active high or active low signal. The
inputs can be driven by a source from 5 to 30 volts. Each
input line is optically isolated from others and from the
computer interface circuits. The isolation voltage rating
between the input and output of the photocoupler device
exceeds 2500V.
Front and Back Picture of ISM-TRM-ISO-IN
Technical Specifications
Electrical
After the optical isolation circuit, each of the input lines has
a MC14490 contact bounce eliminator. Its purpose is the
elimination of extraneous level changes that result when
interfacing with mechanical contacts from devices such as
switches or relays. The circuit takes an input signal from a
bouncing contact and generates a clean digital signal four
clock periods after the input has stabilized. This results in
about a 60 microsecond delay for debouncing. This circuit
will remove bounce on both the “make” and “break” of a
contact closure. It will pass up to a 34KHz signal. Then the
signal goes to a 50-pin header that allows easy connection
to a single board computer or I/O board.
Inputs
24 optically isolated
Input voltage
5 – 30V
Isolation
2500 VAC
Input impedance 3.3K ohms
Debounced input Yes
Power Requirements
Vcc = +5V ±5% @ 1 mA typical
Environmental
Operational from -40°C to +85°C
Non-condensing relative humidity 5% to 95%
RoHS compliant Yes
Mechanical
Dimensions
Weight
3.6 x 3.8 inches (90 x 96mm)
1.8 oz. (51gm)
Interface Cables - The ISM-TRM-ISO-IN board is connected
with a 50-pin IDC standard 0.100-inch keyed ribbon cable
to the digital I/O controller. WinSystems offers ribbon
cables that connect directly for our single board computers
and I/O modules to the ISM-TRM-xxx cards. Their lengths
and part numbers are listed on our website.
Connectors
Board Mounting - The board measure 3.6 x 3.8 inches
(90 x 96mm) and has the same mounting hole pattern as
PC/104 modules. It is referred to as an Industry Standard
Module (http://www.sff-sig.org/ism_spec_v10.pdf ). An
ISM-TRM-ISO-IN can be placed on the top or bottom of
a stack, but it does not have the PC/104 connector and
therefore does not pass through power, data, or control
signals.
ISM-TRM-ISO-IN 24 Line signal conditioning module with
optically isolated inputs
Field wiring
I/O controller
3.5 mm pluggable terminal block
headers organized as eight lines per
connector
50-pin 0.100 inch IDC keyed header
Ordering Information
WinSystems reserves the right to make changes to products and/or documentation without further notification.
Product names of other companies may be trademarks of
their respective companies.
WinSystems | 715 Stadium Drive, Arlington, TX 76011 USA | Tel 817-274-7553 | [email protected] | www.WinSystems.com