The X-17s™ expansion module is used in conjunction with an X-400 or X-600M controller. The X-17s is a multi-function module with four relays and four optically-isolated digital inputs. One or more X-17s expansion modules can be connected to an X-400 or X-600M controller with a ribbon cable which provides both power and communications.

The four relays have Form-A contacts (SPST) and can be used to control moderate loads such as solenoid valves, alarms and indicator lights.

The isolated inputs are suitable for use in industrial environments and allow the grounding system of the monitored equipment and the low voltage circuits of the X-17s to be electrically separate. Internally the X-17s has a co-processor which provides enhanced features including: pulse counting, pulse duration, accumulated pulse time and frequency measurements. All four inputs have separate measurements. Programmable de-bounce timers allow glitches and short pulses to be filtered out.

The X-400 or X-600M together with the X-17s provide an easy, flexible and reliable way to monitor sensors and control devices over a network. The X-17s is suitable for use with security systems, freezer doors, light switches and water meters, as well as with moderate loads such as solenoid valves, alarms and indicator lights.

Other expansion modules with different I/O combinations are also available.

X-17s Part Number

X-17s Relays: 4 (125VAC, 30VDC) Digital: 4 (3-26VDC) 9-28 VDC (supplied via the X-400 or X-600M controller, 24V recommended)


  • Four isolated relays (SPST)
  • Relay Functions:
    • On
    • Off
    • Pulse
  • Four optically-isolated digital inputs (common negative)
  • Input Functions:
    • On/Off Status
    • Pulse Count
    • Pulse Duration
    • Accumulated Pulse Time
    • Frequency
  • Powered through expansion bus – no separate power supply connections are required
  • Eight LEDs for inputs and outputs
  • Removable terminal connector

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 & Relays OFF All Opto-couplers & Relays ON
9 VDC 18 mA 224 mA
12 VDC 14 mA 165 mA
24 VDC 8 mA 86 mA

Relay Contacts

  • Number of Relays: 4
  • Max Voltage: 125VAC, 30VDC
  • Max Current: 2.5A
  • Contact Type: SPST (Form 1A)
  • Load Type: General purpose
  • Contact Resistance: < 100 milliohms initial
  • Contact Material: AgSnO2
  • Electrical Life: 100K operations (Min)
  • Mechanical Life: 5M cycles (Min)
  • Environmental Rating: Over voltage Category II, Pollution Degree 2
  • Relay Modes: On/Off or Pulsed
  • Pulse Timer Duration: 0.1 to 86,400 Seconds (1-day)

Digital Inputs

  • Number of Inputs: 4
  • 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: 1 Hz min, 200 Hz max


  • Relays & Inputs: 14-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
    • Relay coil energized 1-4
    • Digital Inputs 1-4


  • 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)
Place your order today! Contact us
EMI Softech