ABB|ASTO-21C|Safety board
Description:
The ASTO-21C is a safety board designed for use in ABB ACS800 drives and inverter modules, specifically for frames R7i to R8i. It provides Safe Torque Off (STO) functionality to prevent unexpected start-up and ensure safe operation in industrial environments.
Features:
- Safe Torque Off (STO) functionality
- Suitable for frames R7i to R8i of ACS800 drives
- Complies with IEC 61508 and EN/ISO 13849-1 standards
- Integrated into drive modules for compact installation
Technical Specifications:
- Supply Voltage Range: +24 V DC +/- 10%
- Current Consumption: 40 mA (20 mA/channel)
- Supply Cable: Single-shielded twisted pair
- Maximum Cable Length: 300 m
- Conductor Min. Cross Section: 0.5 mm², 20 AWG
- Logic Levels: "0" < 5 V DC, "1" > 17 V DC
- Ambient Temperature: 0…50 °C
- Relative Humidity: Max. 90%, no condensation allowed
- Altitude in Operation: 0…2000 m
- Dimensions: Not specified for ASTO-21C specifically; refer to ASTO-21 for general dimensions
- Weight: Not specified for ASTO-21C specifically; refer to ASTO-21 for general weight
- Degree of Protection: IP20
- Safety Standards Compliance: SILCL 3 according to EN 62061, PL e according to EN ISO 13849-1
-
Safety Data:
- SIL/PL: 2
- PFH (Probability of dangerous failure per hour): 8.72E-10 (for R7/R7i, R8/R8i)
- PFDavg (Average probability of dangerous failure on demand): 8.03E-06 (for T1 = 5 years)
- MTTFD (Mean time to dangerous failure): 4993 years (for R7/R7i, R8/R8i)
ABB|ASTO-21C|Safety board

ABB|ASTO-21C|Safety board
Description:
The ASTO-21C is a safety board designed for use in ABB ACS800 drives and inverter modules, specifically for frames R7i to R8i. It provides Safe Torque Off (STO) functionality to prevent unexpected start-up and ensure safe operation in industrial environments.
Features:
- Safe Torque Off (STO) functionality
- Suitable for frames R7i to R8i of ACS800 drives
- Complies with IEC 61508 and EN/ISO 13849-1 standards
- Integrated into drive modules for compact installation
Technical Specifications:
- Supply Voltage Range: +24 V DC +/- 10%
- Current Consumption: 40 mA (20 mA/channel)
- Supply Cable: Single-shielded twisted pair
- Maximum Cable Length: 300 m
- Conductor Min. Cross Section: 0.5 mm², 20 AWG
- Logic Levels: "0" < 5 V DC, "1" > 17 V DC
- Ambient Temperature: 0…50 °C
- Relative Humidity: Max. 90%, no condensation allowed
- Altitude in Operation: 0…2000 m
- Dimensions: Not specified for ASTO-21C specifically; refer to ASTO-21 for general dimensions
- Weight: Not specified for ASTO-21C specifically; refer to ASTO-21 for general weight
- Degree of Protection: IP20
- Safety Standards Compliance: SILCL 3 according to EN 62061, PL e according to EN ISO 13849-1
-
Safety Data:
- SIL/PL: 2
- PFH (Probability of dangerous failure per hour): 8.72E-10 (for R7/R7i, R8/R8i)
- PFDavg (Average probability of dangerous failure on demand): 8.03E-06 (for T1 = 5 years)
- MTTFD (Mean time to dangerous failure): 4993 years (for R7/R7i, R8/R8i)