X-21s – EMI Softech

Overview

The X-21s™ Four Relay Expansion Module is used with an X-400 or X-600M controller. The X-21s has four relays each with Form-C/SPDT contacts.

Required Controller

One or more X-21s expansion modules can be connected to an X-400/X-600M controller with an expansion cable. The expansion cable provides both power and communications to the expansion modules.

Controller Features

The X-400/X-600M are multi-function web-enabled industrial I/O controllers. They perform control, logic, and monitoring functions similar to that of a Programmable Logic Controller (PLC). However, unlike a PLC, these controllers are designed for web-based applications from the ground up.

No add-on software or hardware is required. The controllers can be fully configured, programmed and tested directly in the device using its built-in web server and a standard web browser. The web setup pages are intuitive and easy to use and do not require special programming skills.

Applications

The X-400/X-600M controllers, together with expansion modules, such as the X-21s, provide an easy, flexible, and reliable way to monitor and control systems and devices over a network. The X-21s is suitable for use with moderate loads such as solenoid valves, alarms, and indicator lights.

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

Tank Battery Level Monitoring with Pump and Valve Control

X-21s | Four Relay Expansion Module

PART NUMBER	OUTPUTS/INPUTS	POWER SUPPLY
X-21s	Relays: 4 Form 1C / SPDT (125VAC, 28VDC, 2.5A)	9-28 VDC (supplied via the X-400 or X-600M controller, 24V recommended)

Features

Four, Form C/SPDT relays (independently controlled)
- Voltage: 125VAC, 28VDC
- Current: 2.5A
LED indicators for relay and power status
Operating Temp: -40°F to 122°F (-40°C to 50°C)
Storage Temp: -40°F to 185°F (-40°C to 85°C)
Removable terminal connector
Powered through expansion bus – no separate power supply connections are required
Requires an X-400 or X-600M controller
Great for moderate-load applications including:
- Solenoid valves
- Alarms
- Indicator lights
- and much more…

Specs

Power Requirements

Voltage: 9-28 VDC (supplied via the X-400 or X-600M controller, 24V recommended)
Max Current:

Power Supply	All Relays OFF	All Relays ON
9 VDC	17 mA	270 mA
12 VDC	13 mA	189 mA
24 VDC	7 mA	110 mA

Relay Contacts

Number of Relays: 4
Max Voltage: 125VAC, 28VDC
Max Current: 2.5A
Contact Type: SPDT
Load Type: General Purpose
Contact Resistance: < 100 milliohms initial
Contact Material: AgNi
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)

Connectors

Relays: 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: 5
- Power on
- Relay coil energized 1-4

Physical

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