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Description
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 07AC91 |
| Order Number | GJR5252300R0101 |
| Manufacturer | ABB (ASEA Brown Boveri) |
| Product Type | Distributed Analog I/O Unit (Remote I/O Module) |
| Product Series | Advant Controller 31 (AC31 / AC31 90 Series PLC) |
| System Bus | CS31 Field Bus (EIA RS-485 physical layer, electrically isolated) |
| Operating Modes | 12-bit mode (high precision) / 8-bit mode (high density) |
| Channels (12-bit mode) | 8 Analog Inputs (AI) + 8 Analog Outputs (AO) |
| Channels (8-bit mode) | Up to 16 channels, configurable in pairs as AI or AO |
| Input Signal Types | ±10 V, 0…10 V, 0…20 mA, 4…20 mA (per channel configurable) |
| Output Signal Types | ±10 V, 0…10 V, 0…20 mA, 4…20 mA |
| Resolution | 12-bit + sign (precision mode) / 8-bit (density mode) |
| Conversion Error | Typically 0.5%, Maximum 1.0% |
| Input Impedance (voltage) | >100 kΩ |
| Input Impedance (current) | ≈330 Ω |
| Output Load (voltage) | Max ±20 mA (source/sink) |
| Output Load (current) | 0…500 Ω |
| Supply Voltage | 24 V DC (allowable range 19…30 V DC) |
| Current Consumption | Max. 0.2 A |
| Power Dissipation | Max. 5 W |
| Diagnostics | 17 status LEDs (1 system + 16 channel-specific) |
| Fault Indication | ERR, Test, Out of Range LEDs; wire-break detection; range alarm |
| Electrical Isolation | CS31 bus isolated from internal circuitry |
| Enable Inputs | 2 electrically isolated digital inputs (24 V DC) for AO enable |
| Terminals | Removable screw-type terminal blocks; max. 1×2.5 mm² or 2×1.5 mm² |
| Mounting | 35mm DIN rail (DIN EN 50022-35) or 4× M4 screws |
| Installation Position | Vertical, connector terminals pointing upward/downward |
| Dimensions (W×H×D) | 120 × 140 × 85 mm |
| Weight | 450 g (module only) / 0.81 kg (with terminals) |
| Protection Rating | IP20 (for installation inside control cabinet) |
| Operating Temperature | 0°C to +55°C |
| Storage Temperature | -25°C to +75°C |
| Humidity | 10%…90% RH, non-condensing |
| Cooling | Natural convection (must not be blocked) |
| Certifications | CE, ABS Marine Classification, CSA |
| EAN Code | 4013614267666 |
| Lifecycle Status | Legacy / Discontinued – available as original stock or refurbished spare part |
Main Features and Advantages
The ABB 07AC91 distinguishes itself in the industrial automation spare parts market through its unique dual-mode configuration architecture, a flexibility rarely found in competing analog I/O modules. By simply adjusting internal DIL switches, the ABB 07AC91 transforms from a high-precision 12-bit device delivering 8 analog inputs and 8 analog outputs with ±10V or 0-20mA signals, into a high-density 8-bit unit offering up to 16 freely configurable channels. This adaptability means a single spare part can serve multiple roles within an AC31 automation system, dramatically reducing inventory complexity and ensuring the ABB 07AC91 remains relevant across evolving process requirements.Superior signal integrity and electrical isolation represent another cornerstone advantage of the ABB 07AC91. The CS31 bus interface is galvanically isolated from the internal analog circuitry, effectively preventing ground loops and electromagnetic interference from corrupting critical measurement data in electrically noisy industrial environments. Each channel’s individual configurability for voltage or current signals—spanning ±10V, 0-10V, 0-20mA, and 4-20mA standards—eliminates the need for external signal converters, while the high input impedance (>100kΩ for voltage, ≈330Ω for current) ensures minimal loading on field transmitters. The ABB 07AC91 achieves typical conversion accuracy of 0.5% with maximum error of 1.0%, delivering industrial-grade precision suitable for closed-loop PID control of temperature, pressure, flow, and level processes.Comprehensive diagnostic capability sets the ABB 07AC91 apart from conventional analog I/O modules. The front panel features 17 status LEDs: one system/ready indicator plus 16 channel-specific diagnostic lights that instantly reveal overload conditions, wire-break detection, and signal out-of-range alarms. Three dedicated LEDs—ERR (module/bus fault), Test (test mode active), and Out of Range (analog signal exceeding limits)—provide at-a-glance operational status, enabling maintenance personnel to rapidly pinpoint faults without software intervention. The ABB 07AC91 additionally incorporates two electrically isolated 24V DC enable inputs that allow safety interlock circuits to globally enable or disable all analog outputs, a critical feature for fail-safe process control applications.From a mechanical and installation perspective, the ABB 07AC91 offers exceptional convenience through its compact 120×140×85mm form factor and lightweight 450g (module only) construction. The removable screw-type terminal blocks accommodate wiring up to 1×2.5mm² or 2×1.5mm² per terminal, facilitating rapid installation and hassle-free module replacement without disturbing field wiring. DIN rail mounting per DIN EN 50022-35 standard or optional M4 screw fixation provides secure mechanical attachment, while the vertical installation requirement with upward/downward facing terminals ensures optimal natural convection cooling. The ABB 07AC91 holds CE, ABS marine classification society, and CSA certifications, confirming its suitability for deployment in industrial, marine, and North American hazardous environments alike.
