X-15S™ | 8 Digital Input Expansion Module

Engineering & Marketing International

Security Sensors, Storage, Access Control, & More

  • X-15S

The X-15S™ eight-digital-input expansion module is used with an X-400™ or X-600M™ controller. Each input is optically isolated and allow the grounding system of equipment and the low-voltage circuits of the X-15S to be electrically separate. One or more X-15S expansion modules can be connected with a ribbon cable that provides both power and communication.

  • 8 Digital Inputs
  • Expansion Module for the X-400 or X-600M

An X-400 or X-600M connected with an expansion module like the X-15S provides an easy, flexible, and reliable way to monitor and control systems and devices over a network. The X-15S is fit for applications that include storage facilities, access control, and security. It’s great for monitoring door sensors, digital pulse meters, button/switch inputs, machine status, and more.

X-15S Features

  • 8 optically isolated digital inputs
  • Digital input functions: Monitor State, Control Relays, Control Remote Relays, Count, Frequency, High Time, ON Time
  • 8 LEDs for inputs 1-8
  • Removable terminal connector
  • Powered through expansion bus (no separate power supply connections are required)


Power Requirements

  • Voltage: 9-28 VDC (supplied via the X-400 or X-600M controller, 24V recommended)
  • Max Current: See table below for typical values at 25°C.
Power Supply All Opto-couplers OFF All Opto-couplers ON
9 VDC 17 mA 88 mA
12 VDC 13 mA 66 mA
24 VDC 8 mA 36 mA

Digital Inputs

  • Number of Inputs: 8
  • Type: Optically-Isolated
  • Voltage Range: 3-26VDC
  • Current: 0.6mA @ 3V, 8.2mA @ 26V
  • Minimum Hold Time: 2.5mS
  • Input Isolation: 1500V
  • Input Functions: Monitor State, Control Relays, Control Remote Relays, Count, Frequency, High Time, ON Time
  • Maximum Count: 32-bit
  • Max Count Rate: 200Hz
  • Edge Trigger: Rising, Falling or Both
  • High Time: Pulse width (4,194,304 seconds max)
  • On Time: Accumulated time an input is asserted (4,194,304 seconds max)
  • Frequency: 1Hz min, 200 Hz max


  • Inputs: 12-Position, 3.81mm terminal spacing, Removable. For 16-28 AWG wire.
  • Expansion Connector: Ribbon cable, 10-conductor, polarized, 2×5-position, 0.100″ pitch Provides power and communications for expansion modules (Communications: RS-485)

LED Indicators

  • Number of LEDs: 9
    • Power on
    • Digital Inputs 1-8


  • Size:
    • 1.41in (35.7mm) wide
    • 3.88in (98.5mm) tall
    • 3.1in (78mm) deep (not including connector)
  • Weight: 4.8 oz (136 g)
  • Enclosure Material: Lexan 940 Polycarbonate Plastic
  • Enclosure Flame Rating: UL94 V0


  • Operating Temperature: -40°F to 150°F (-40°C to 65.5°C)
  • Storage Temperature: -40°F to 185°F (-40°C to 85°C)
  • Humidity: 5-95%, non-condensing
  • Altitude: Up to 2,000m
  • Indoor use or NEMA-4 protected location

Electromagnetic Compliance

  • IEC CISPR 22, CISPR 24
  • FCC 47CFR15 (Class B)
  • EN55024 ITE Immunity (2010)
  • EN55022 Emissions (2010)

Product Safety Compliance

  • UL 61010-1 (Electrical Equipment for Measurement, Control, and Laboratory Use)