Power

24 Vac ±10%, 50–60 Hz, 20 VA power consumption, single Class 2 source only, 100 VA or less

CMnet port

For communication with the controller network using ARC156 or MS/TP (9600 bps or 38.4 kbps)

Access port

For local access to start up and troubleshoot system

Auxiliary device port

For communication with a BACview®¹ or BACview®² device

Inputs

2 universal inputs, configurable for 0–5 Vdc, 0–20 mA, thermistor, dry contact, or pulse counter

Input resolution

10 bit A/D

Input pulse frequency

10 pulses per second. Minimum pulse width (on or off time) required for each pulse is 50 msec.

Digital outputs

2 digital outputs, relay contacts rated at 3 A resistive @ 24 Vac. Configured normally open.

Output resolution

8 bit D/A

Microprocessor

32-bit Motorola MC68-series microprocessor

Memory

512 kB non-volatile battery-backed RAM, 512 kB Flash memory

Real-time clock

Battery-backed real-time clock keeps track of time in event of power failure

Battery

7-year Lithium BR2325 battery retains the following data for a maximum of 10,000 hours during power outages:  time, control programs, editable properties, schedules, and trends.

Protection

Built-in surge and transient protection for power and communications in compliance with EN61000-6-1.

Incoming power and network connections are protected by non-replaceable internal solid-state polyswitches that reset themselves when the condition that causes a fault returns to normal.

The power, network, input, and output connections are also protected against transient excess voltage/surge events lasting no more than 10 msec.

CAUTION To protect against large electrical surges on serial EIA-485 networks, place a PROT485 at each place wire enters or exits the building.

Status indicators

LEDs indicate status of communications, running, errors, and power

Environmental operating range

0 to 130°F (-17.8 to 54.4°C), 10–90% relative humidity, non-condensing

Physical

Rugged aluminum cover, removable screw-type terminal blocks

Overall dimensions

Width:
Height:

8 7/8 in. (22.5 cm)
7 1/2 in. (19 cm)

Mounting dimensions

Width:
Height:

8 3/8 in. (21.3 cm)
5 in. (12.7 cm)

Recommended panel depth

2 3/4 in. (7 cm)

Weight

1.6 lbs (0.73 kg)

BIBB support

Supports BACnet Interoperability Building Blocks (BIBB's) from the following groups: Data Sharing, Alarm and Event Management, Scheduling, Trending, and Device and Network Management. See PICS for details.

Listed by

UL-916 (PAZX), cUL-916 (PAZX7), FCC Part 15-Subpart B-Class A, CE

Signal Type

Description

Thermistor

Precon type 2 (10 kOhm at 77°F). Input voltages should be from 0.489 Vdc to 3.825 Vdc for thermistors.

Dry contact

A 5 Vdc wetting voltage detects contact position, resulting in a 0.5 mA maximum sense current when the contacts are closed.

0–5 Vdc

The output impedance of a 0–5 Vdc source must not exceed 10 kOhms. The input impedance of the M220nx is approximately 1 MOhm.

0–20 mA

The input resistance on each A terminal is 250 Ohms. The B terminal supplies a voltage source to power the 4–20 mA transducer. Each B terminal is capable of supplying 18–24 Vdc, but the total current drawn by all B terminals must not exceed 200 mA. If the voltage measured from any B terminal to Gnd is less than 18 Vdc, you need to use an additional external power supply.

Pulse counter *

Pulse counting up to 10 pulses per second.
Minimum pulse width (on or off time) required for each pulse is 50 msec.