Month: October 2026

The AO895 Analog Output Module has 8 channels. The module includes

Intrinsic Safety protection components and a HART interface on each

channel for connection to process equipment in hazardous areas without

the need for additional external devices.

Each channel can drive up to 20 mA loop current into a field load such as

an Ex-certified current-to-pressure converter and is limited to 22 mA in

overload conditions. All eight channels are isolated from the ModuleBus

and power supply in one group. Power to the output stages is converted

from the 24 V on the power supply connections.

Features and benefits

• 8 channels of 4…20 mA outputs.

• HART communication.

• 1 group of 8 channels isolated from ground.

• Power to drive Ex certified I/P actuators.

Features and benefits

• 4 channels of -20 mA .+20 mA, 0 .20 mA, 4 .20 mA or -10 V .+10 V, 0 .10 V, 2 .10 V outputs

• Individualy galvanicaly isolated channels

• OSP sets outputs to predetermined state upon error detection.”

The AO820 Analog Output Module has 4 bipolar analog output

channels. The choice of current or voltage output is configurable for

each channel. There are separate sets of terminals for voltage and

current outputs, and it is up to the user to wire outputs properly. The

only differences between current or voltage channel configuration is

in software settings.

To supervise the communication to the A/D-converters the output

data is read back and verified. The opencircuit diagnostics are read

continuously as wel. The process voltage supervision input give

channel error signals if the voltage disappears. The error signal can

be read via the ModuleBus.

The HBS01-CJC the mounting base is for Singular AI03 (8-CH) RTD and AI04 (16-CH)

TC & mV Analog Input modules. The base includes a built-in RTD that can be used

for Cold Junction Compensation.

Two (2) 16-point headers on the base provide connections to either (2) pluggable

16-point terminal blocks for direct connection of field signal wires or to SPK0x_-yy

marshaling cables when field signal wires are landed on 3rd party termination hardware.

Features and benefits

• Termination for up to eight (8) 2/3/4/ wire RTDs or sixteen (16) TC / mV process

signals within a horizontal row.

• All SD I/O modules & bases of all types (Singular or Redundant) AND (Compact or

Full-size), are 100% fully compatible with each other. Thus, Singular & Redundant,

Compact or Full-size I/O modules can be mounted within a single, common HN800 I/O bus.

• Optional mechanical keying can be implemented to prevent insertion of the wrong I/O

module type.

• Latching device on the base locks the base into position on DIN-Rail.

• Industry standard 35-mm DIN rail, Horizontal row mounting.

ACH550 upgrade basics

Record nominal power, current, voltage, etc. ratings taken

from your motor nameplate (to use in the ratings

comparison tables)

What type of signal is the speed/frequency command? e.g.

0-10VDC, 4-20 mA, via communications, or other?

Where is the speed/frequency command landed on the

drive?

What type of signal is the start/stop command? e.g. a relay

closure, via communications, or other?

Where is the start/stop command terminated on the drive?

Are there any other control or reference sources that

require additional IO options?

Are you using a door mounted control panel on an

enclosure door? If so, consider appropriate kit/method for

replacement keypad.

Are you using a door mounted control panel? Consider this

when choosing options

Consider the dimensions and mounting requirements,

cable sizes and heat losses

Review the control terminal wiring and ensure the cable

lengths are sufficient

Is the Building Automation System communicating with the

drive over a communication protocol? e.g. BACnet. If so,

document the appropriate communication settings, such

as MAC ID, Device Object Instance ID, Baud, etc.

Are there any analog outputs from the drive that are wired

to another device? If so, document the type of signal (e.g

4-20 mA), where it was terminated on the drive, what it was

used for, and any scaling of the signal.

Are there any relay outputs from the drive that are wired to

another device? If so, document where it was landed on the

drive and what it was used for.

Are there any other control or reference sources that

require additional IO options?

This guide will help you to replace the ACH550 drive with the

ACH580 HVAC drive. Follow the steps outlined in this guide to

find the optimal replacement product and to expedite the

replacement process.

Step 1: Sizing of the drive and selecting options

Compare power range, mounting methods and dimensions to

select the appropriate ACH580 product compared to the

ACH550 drive, see the checklist items for some useful

guidance.

Step 2: Wiring and parameter setup

Compare electrical data and basic parameter range for optimal

replacement. Use the replacement ACH580 manual to assist

with the commissioning process.

Before beginning, some basic checklist items

All information regarding the control of your application

should be gathered from the ACH550 prior to selecting and

performing the actual replacement, control and parameter

settings should be noted to ensure consistency in the

replacement ACH580.

This checklist covers the main information you may require to

guide you through the replacement process. If the ACH550

cannot be powered, the technician should gather all the

information below that is not parameter related.

Using the comparison guide

Important notice

This guide is intended for limited distribution to ABB’s channel

partners and customers who are replacing the ACH550 drive

with the ACH580 HVAC drive. ABB has prepared this document

to aid sales associates, authorized channel partners and

customers in the drive replacement. Every attempt has been

made to ensure the accuracy of the information.

All installation and electrical work should be carried out by a

trained professional. ABB takes no responsibility for any

damages or other liability whatsoever (including any

consequential damages, even if ABB or an ABB representative

had advised of the possibility of such damages) resulting from

the use or selection of this document for any information,

apparatus, method, process, or similar item disclosed in this

guide. Specification is subject to change without notice.

Features and benefits

• 4 channels individualy galvanic isolated inputs for +20 mA, 0 .20 mA, 4 .20 mA, +10 V, 0 .10 V, 2 .10 V

• 14 Bit resolution plus sign

• Input shunt resistors protected to 30 V d.c.

• The input withstands HART communication

The AI825 Analog Input Module has 4 individualy galvanic isolated,

bipolar current/voltage inputs. Each channel can be either a voltage

or current input.

The module has a direct current input that withstand up to 6.3 V and

a over voltage protected current input that withstand up to +30 V d.c.

The current is limited by a PTC resistor.

Power to the input stages is converted from the 24 V on the

ModuleBus.

Features and benefits

• 8 channels of 4 .20 mA

• 1 group of 8 channels isolated from ground

• Analog inputs are short circuit secured to ZP or +24 V

• HART pass-through communication

The AO815 Analog Output Module has 8 unipolar analog output

channels. The module performs self-diagnostic cyclicaly. Module

diagnostics include:

• External Channel Error is reported (only reported on active

channels) if the process power supply that supply voltage to

output circuitry is too low, or the output current is less than the

output set value and the output set value is greater than 1 mA

(open circuit).

• Internal Channel Error is reported if the output circuit can not

give the right current value.

• Module Error is reported in case of Output Transistor Error, Short

Circuit, Checksum Error, Internal Power Supply Error or

Watchdog error.

The module has HART pass-through functionality. Only point to point

communication is supported. The output filter must be enabled on

channels used for HART communication.