Description
Key Technical Specifications
The following specifications apply to the documented AS111-2 reference, not yet independently confirmed for AS111A-2.
| Parameter | Specification |
|---|---|
| Reference model | AS111-2 |
| OEM reference | C0200550 |
| Manufacturer | ALSTOM / ALSPA |
| Compatible platforms | CE2000 / CE3000 |
| Product type | Analog output I/O module |
| Output channels | 8 |
| Output signal | 0–20 mA or 4–20 mA |
| Process supply voltage | 24 VDC |
| Supply operating range | 19.2–30 VDC |
| Output resolution | 12-bit |
| Current resolution | 5.37 µA |
| Typical full-scale accuracy | ≤0.1% |
| Output refresh period | 50 ms |
| Maximum load | Below 600 Ω at minimum process voltage |
| Output readback | Independent 10-bit monitoring |
| Isolation | Output group isolated from earth and internal processing |
| Diagnostics | Supply loss, disconnected load, hardware and communication faults |
| Protection | PTC protection on process supply and individual channels |
Specification caution: Some secondary listings describe 16-bit conversion, but the more detailed AS111-2 technical listing specifies 12-bit resolution. Do not apply the 16-bit figure to AS111A-2 without its own datasheet.
AS111A-2
Product Introduction
The ALSTOM AS111-2 is an eight-channel analog output module used in ALSPA CE2000 and CE3000 distributed control systems. It converts controller commands into standard industrial current signals for regulating field devices such as control valves, actuators, and positioners.
Its 24 VDC process supply, output-current monitoring, and channel-level protection support analog loop operation in industrial control applications. For an AS111A-2 purchase, the exact hardware designation and revision must be checked before using these specifications for engineering decisions.
Application Scenarios & Field Pitfalls
Typical applications of the documented AS111-2
- Control valve positioning: Supplies analog current commands to compatible valve positioners.
- Actuator regulation: Provides output signals for process actuators requiring 0–20 mA or 4–20 mA control.
- Turbine and power-plant control: Supports analog control loops within compatible ALSPA control installations.
- Process regulation: Interfaces digital controller commands with analog field equipment.
Field considerations
- Model suffix: Confirm whether the installed card is AS111-2 or AS111A-2. Do not assume identical hardware.
- Output scaling: Check whether each channel is configured for 0–20 mA or 4–20 mA before connecting field equipment.
- Load resistance: Confirm the complete loop resistance remains within the module’s permitted load range.
- Process power: Verify the 24 VDC process supply and its voltage stability under operating load.
- Channel diagnostics: Investigate disconnected-load and output-readback faults before replacing the module.
- Firmware and hardware revision: The documented listing identifies firmware U05 A.05.00 and hardware revisions F, G, and H. Confirm the actual installed revision rather than assuming these apply to AS111A-2.
Related Products
- AS111-1 – Related ALSPA analog output module; verify output configuration and hardware compatibility.
- – Documented eight-channel analog output module, OEM reference C0200550.
- AS1112 – Alternative designation reported for ; confirm the physical nameplate.
- ALSPA P320 DCS – Associated control-system family identified in product references.
Procurement and Replacement Notes
For an AS111A-2 procurement request, obtain confirmation of:
- Full model designation, including the letter
A. - OEM material number and hardware revision.
- Firmware identification.
- Output channel configuration.
- Process supply requirements.
- Compatibility with the installed CE2000, CE3000, or P320 system.
For used or refurbished modules, request functional test evidence covering all eight output channels, current readback, process-supply diagnostics, and fault indication.
Procurement recommendation: Do not automatically quote / C0200550 as an exact replacement for . The documented is a useful technical reference, but the suffix difference remains unresolved.
A photograph of the nameplate would help establish whether it is an actual hardware variant or a different module designation.
