ABB AX521 S500 4-Input 4-Output Analog I/O Module
Four analog inputs and four analog outputs combine sensor acquisition and actuator references in one standard S500 module.
Overview
ABB AX521 is a mixed analog I/O module for the AC500 S500 system. It combines four configurable analog inputs with four configurable analog outputs and uses 12-bit resolution including sign. The input side supports documented voltage, current and Pt100 functions, while all four outputs support voltage or current operation. Module-level galvanic isolation separates the module from the I/O bus, and field connection is made through a TU515 or TU516 terminal unit.
Specs
| Manufacturer | ABB |
|---|---|
| Article Number | 1SAP250100R0001 |
| Product Family | AC500 / S500 |
| Module Type | Mixed analog input/output module |
| Analog Inputs | 4 configurable channels |
| Analog Outputs | 4 configurable channels |
| Input Functions | Voltage, current and Pt100 measurement |
| Output Functions | Voltage or current on all 4 outputs |
| Output Ranges | -10 to +10 V; 0 to 20 mA; 4 to 20 mA |
| Resolution | 12 bits including sign |
| Galvanic Isolation | Module against I/O bus and other modules |
| Required Terminal Unit | TU515 or TU516 |
| Lifecycle | Active |
Features
Functional Highlights
- Combines four measurement channels and four command channels in one module.
- Supports voltage, current and Pt100 input tasks.
- Provides voltage or current output capability on each of the four outputs.
- Uses signed 12-bit conversion for supported bipolar signals.
- Separates the complete module from the internal I/O bus by galvanic isolation.
- Works with the established TU515 or TU516 S500 terminal units.
Exact Product Identity
- Manufacturer: ABB
- Model: AX521
- Product Type: AC500 S500 analog input/output module
- Status: Active product
Applications
- Compact AC500 stations that need a balanced four-input and four-output analog mix.
- Temperature acquisition paired with proportional actuator control.
- Process skids combining transmitter signals and analog control references.
- Distributed S500 nodes using TU515 or TU516 field termination.
- Maintenance replacement where both the input and output channel maps must be preserved.
Lifecycle
- ABB lists article 1SAP250100R0001 as Active.
- The AX521-XC environmental variant has a separate article number.
- Do not substitute AX522 merely because it is also a mixed analog module; channel count and current-output architecture differ.
- Retain the terminal unit, signal wiring and controller parameterization during exchange.
- Verify input scaling and output direction independently before enabling closed-loop control.
FAQ
What analog channel balance does AX521 provide?
It provides four configurable analog inputs and four configurable analog outputs.
Can every AX521 output operate in current mode?
Yes. ABB documents voltage or current operation on all four outputs.
Which temperature input is identified for AX521?
ABB documents Pt100 measurement together with voltage and current inputs.
Which S500 terminal units are used with AX521?
TU515 or TU516 is required for field termination.
Is AX521 isolated channel by channel?
ABB specifies module-level isolation from the I/O bus and other modules, not individual channel-to-channel isolation.
Why should AX521 not be replaced solely by matching the number of terminals?
The exact analog functions, ranges, terminal unit, isolation and controller parameters must all match.
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