MODEL: 18AS2

18AS2 SPECIFICATIONS

ES-1769 Rev.3 Page 1/4

http://www.m-system.co.jp/

Rack-mounted DCS Signal Conditioners 18-RACK

DC ALARM

Functions & Features

• Providing relay contact closures at preset DC input levels

• Single or dual (Hi/Lo) trip

• Frontaccessed screwdriver setpoint adjustments

• Enclosed relays

Typical Applications

• Annunciator

• Various alarm applications

MODEL: 18AS2–[1][2]–R

ORDERING INFORMATION

• Code number: 18AS2-[1][2]-R

Specify a code from below for each of [1] and [2].

(e.g. 18AS2-62-R)

• Special input range (For code 0)

Use Ordering Information Sheet (No. ESU-1033) to specify

alarm output code 0 specifications.

[1] INPUT

Current

A: 4 – 20 mA DC (Input resistance 250 Ω)

D: 0 – 20 mA DC (Input resistance 50 Ω)

G: 0 – 1 mA DC (Input resistance 1000 Ω)

H: 10 – 50 mA DC (Input resistance 100 Ω)

Voltage

3: 0 – 1 V DC (Input resistance 1 MΩ min.)

4: 0 – 10 V DC (Input resistance 1 MΩ min.)

5: 0 – 5 V DC (Input resistance 1 MΩ min.)

6: 1 – 5 V DC (Input resistance 1 MΩ min.)

0: Specify voltage (See INPUT SPECIFICATIONS)

[2] ALARM OUTPUT

1: Hi (coil energized at alarm)

2: Hi (coil de-energized at alarm)

3: Lo (coil energized at alarm)

4: Lo (coil de-energized at alarm)

5: Hi/Lo; N.O., OFF in power failure

(connector output not available)

6: Hi/Lo; N.C., OFF in power failure

(connector output not available)

0: Specify

POWER INPUT

DC Power

R: 24 V DC

(Operational voltage range 24 V ±10 %, ripple 10 %p-p max.)

GENERAL SPECIFICATIONS

Construction: Rack-mounted; terminal access via screw

terminals on the front and connector on the rear; terminal

cover provided

Connection

Input: M3.5 screw terminals (torque 0.8 N·m)

Alarm output: M3.5 screw terminals (torque 0.8 N·m) and

connector

Power input: Supplied from connector

Screw terminal: Nickel-plated steel

Isolation: Input to output to power

Relay: Enclosed

Setpoint adjustments: Multi-turn screwdriver adjustments

(front); -5 – +105 % independently

Hysteresis (deadband): Approx. 1 %

Front LEDs: Red LED turns on when the coil is energized.

INPUT SPECIFICATIONS

■ DC Current: Input resistor incorporated

■ DC Voltage: 0 – 300 V DC

Minimum span: 1 V

Offset: Max. 1.5 times span

Input resistance: ≥ 1 MΩ