07 AC 91: Configurable Analog I/O on the ABB CS31 System Bus
The 07 AC 91 is an analog input/output module for the ABB CS31 system bus, and the word that matters is configurable — both the channel counts (8 or 16 analog inputs, 8 or 16 analog outputs) and the channel functions are configuration decisions rather than fixed part characteristics.
That configurability is what consolidates modules. A system that needs 6 analog inputs and 4 analog outputs can be served by one configured module instead of an input module plus an output module.
Rated supply voltage is 24 V DC, maximum current consumption 0.2 A, maximum power dissipation 5 W, protection against reversed polarity is provided, and permissible operating temperature is 0 to 55 °C. Electrical isolation is to the CS31 system bus.
| Feature | Specification |
|---|---|
| Manufacturer | ABB |
| Brand | ABB |
| Part Number | 07 AC 91 |
| Permissible temperature range during operation | 0...55 °C Rated supply voltage: 24 V DC Max. current consumption: 0.2 A Max. power dissipation: 5 W Protection against reversed polarity: yes Number of binary inputs: 1 Number of analog input channels: 8 or 16 Number of analog output channels: 8 or 16 Electrical isolation: CS31 system bus interface from rest of unit, 1 binary input from rest of unit Operation and error displays: total of 17 LEDs Weight: 450 g Dimensions (WxHxD): 120 x 140 x 85 mm |
ABB CS31 Analog I/O Modules
On the CS31 system bus the module choice is driven by whether channels are input, output or a mix, and by the channel count the application needs. Confirming against the bus configuration rather than against a datasheet headline avoids a module that fits the slot but not the signal plan:
| ABB Part Number | Module Function |
|---|---|
| AI910B | CS31 system bus I/O module — confirm channel type and count against the bus configuration |
| AI910N | CS31 system bus I/O module — confirm channel type and count against the bus configuration |
| AI910S | CS31 system bus I/O module — confirm channel type and count against the bus configuration |
| AI930B | CS31 system bus I/O module — confirm channel type and count against the bus configuration |
| AI930N | CS31 system bus I/O module — confirm channel type and count against the bus configuration |
| AI930S | CS31 system bus I/O module — confirm channel type and count against the bus configuration |
| AI931B | CS31 system bus I/O module — confirm channel type and count against the bus configuration |
| AI931N | CS31 system bus I/O module — confirm channel type and count against the bus configuration |
ABB CS31 Analog I/O Modules
On the CS31 system bus the module choice is driven by whether channels are input, output or a mix, and by the channel count the application needs. Confirming against the bus configuration rather than against a datasheet headline avoids a module that fits the slot but not the signal plan:
| ABB Part Number | Module Function |
|---|---|
| AI910B | I/O module — confirm channel type and count against the bus configuration |
| AI910N | I/O module — confirm channel type and count against the bus configuration |
| AI910S | I/O module — confirm channel type and count against the bus configuration |
| AI930B | I/O module — confirm channel type and count against the bus configuration |
| AI930N | I/O module — confirm channel type and count against the bus configuration |
| AI930S | I/O module — confirm channel type and count against the bus configuration |
| AI931B | I/O module — confirm channel type and count against the bus configuration |
| AI931N | I/O module — confirm channel type and count against the bus configuration |
Configuration Changes the Card Inventory
Because channel counts are configurable, the module count required for a given I/O mix is a design decision rather than a fixed calculation. On a system that has grown incrementally, that means the as-built card count may no longer match the current I/O requirement — and the module in the rack may be able to absorb points that a replacement-count calculation would suggest need new hardware.
Reversed Polarity Protection Is a Field-Failure Safeguard
Protection against reversed polarity is specified, which matters more on CS31 than the rating suggests. A mis-wired supply on a 24 V bus is a common installation error, and without that protection it is a damaged module; with it, it is an incident that gets corrected.
Thermal Budget for Dense Configurations
Maximum power dissipation is 5 W, and that figure is reached at full configuration. In a densely populated CS31 cabinet, several modules at 5 W each is a real heat load — confirm the cabinet ventilation against the as-built dissipation before filling slots.
Supply & terms: Stock status: In Stock · Condition: New · Warranty: One Year · Origin: Switzerland. Listed by AutoDCS Tech Parts Team · Last updated .
Availability & Condition at AutoDCSTech
| Part Number | 07 AC 91 |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | Switzerland |
