Description
ABB AM801F Battery Module | AC 800F RAM Backup | PM 802F
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product | AM801F |
| Product Type | Battery Module |
| System | ABB AC 800F / Freelance |
| Supported CPU | PM 802F |
| Battery Function | RAM and real-time-clock retention |
| Installation Position | E1 or E2 |
| Supply from CPU Board | 3.3 V / 5 V, ±3% |
| Power Consumption | Approx. 0.25 W |
| Battery Type | 3.6 V lithium |
| Battery Capacity | 950 mAh |
| Low-Battery Signal | ≤ 2.4 V |
| Weight | Approx. 0.150 kg without battery / 0.170 kg with battery |
| Battery Holder | SY 809F |
| Buffer Battery | SB 808F |
The documented AC 800F technical data specifies 3.3/5 V supply from the CPU board, approximately 0.25 W consumption, and a 3.6 V lithium battery. ABB documentation identifies SB 808F as the buffer battery supplied with the AM801F arrangement.
Product Introduction
ABB AM801F Battery Module
The ABB AM801F is a battery backup module for the AC 800F FieldController, primarily supporting the PM 802F CPU board. Its purpose is to retain RAM data when the controller is powered down or when an Ethernet module is absent, helping prevent loss of controller configuration and real-time-clock information.
AM801F is installed only in the AC 800F E1 or E2 slots. The module contains a battery holder and battery-status monitoring, while the documented hardware uses a 3.6 V lithium buffer battery.
AM801F
Application Scenarios & Field Pitfalls — Engineer’s Perspective
Engineering Pain Point
is normally encountered during maintenance of older AC 800F controllers where RAM retention is required during shutdown, Ethernet-module replacement, or controller service.
Typical Applications
- PM 802F controller maintenance — Provides battery-backed retention for internal RAM.
- Standalone AC 800F installations — Useful where no Ethernet module is installed.
- Ethernet module replacement — Helps preserve configuration data while the communication module is being serviced.
- Legacy Freelance DCS spare inventory — Suitable as a dedicated AC 800F battery-module spare.
Technical Pitfalls to Avoid
- Do not substitute for AM811F on PM 803F.
ABB explicitly states that provides no battery buffering when paired with PM 803F. AM811F is specified for PM 802F and PM 803F configurations. - Install only in E1 or E2.
The AC 800F documentation explicitly restricts the battery module to these two slots. Installing it in another module position is not a valid configuration. - Check the battery, not only the module.
A visually good can still have a depleted buffer battery. The module provides a Batt Low indication when the battery voltage is insufficient. - Avoid removing the only active battery source while the controller is powered down.
ABB warns that removing the battery holder when the AC 800F is off and no other E-slot battery module is providing buffering can result in loss of RAM data and real-time-clock configuration.
Related Products
- ABB AM811F — Later battery backup module supporting PM 802F and PM 803F; the preferred option where PM 803F is installed.
- ABB PM 802F — AC 800F CPU/basic unit specifically supported by .
- ABB PM 803F — AC 800F CPU/basic unit requiring AM811F rather than for battery buffering.
- ABB SB 808F — 3.6 V lithium buffer battery associated with the AC 800F battery system.
- ABB SY 809F — Battery holder used with the buffer battery.
- ABB SA 801F — 115/230 VAC power supply for the earlier AC 800F configuration.
- ABB SD 802F — 24 VDC power supply for the AC 800F.
- ABB EI 801F — 10Base2 Ethernet module in the earlier AC 800F family.
- ABB EI 803F — 10BaseT Ethernet module for AC 800F.
- ABB FI 830F — PROFIBUS fieldbus module for the AC 800F.
Procurement Check
For an replacement, verify:
+ PM 802F + E1/E2 slot + battery condition + existing AC 800F hardware revision.
The most important distinction is straightforward: is a PM 802F battery module; AM811F is the appropriate battery module where PM 803F requires buffering. Do not approve the two solely because their physical appearance is similar.
