A digital storage component in industrial control systems that holds the current operational state of a machine or process for real-time monitoring and decision-making.
| Parameter | Typical range | Notes & selection driver |
|---|---|---|
| Bit Width | 8 to 64 bits | |
| Interface | Parallel bus, SPI, I2C, or integrated in PLC memory map | |
| Memory Type | Volatile (SRAM) or non-volatile | |
| Voltage Levels | 3.3V or 5V DC | |
| Clock Frequency | Up to 100 MHz | |
| Operating Temperature | -20°C to +85°C |
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This component is used in the following industrial products
Digital circuit or software module that manages operational states and transitions within a power management system
A digital logic circuit that sequences and controls operations within a larger control system based on defined states and timing signals.
A control logic component that manages sequential operations by transitioning between predefined states based on inputs and conditions.
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A state register specifically holds status bits representing machine operational modes (e.g., running, error), while general-purpose registers store temporary data for calculations. State registers are directly linked to control logic decisions.
In PLCs, state registers are typically memory addresses (e.g., M-bits in Siemens, B3 words in Allen-Bradley) mapped to ladder logic or structured text, updated during each scan cycle based on input conditions and program logic.
Yes, critical applications often use dual or triple redundant registers with voting logic to ensure fault tolerance, especially in safety-rated systems per ISO 13849.
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