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Safety Control Unit SF-C21
Panasonic — SF-C21 Series
A configurable safety controller that replaces multiple discrete safety relays with a single compact unit, wired and programmed via a PC configurator rather than hardwired relay logic. Combines inputs from e-stops, light curtains, and interlock switches and drives safety outputs, meeting ISO 13849-1 Category 4 / PLe and IEC 61508 SIL3.
Key Features
- Safety controller replacing up to 4 conventional safety relay units
- ISO 13849-1 Category 4, PLe
- IEC 61508 / IEC 62061 SIL3
- Configurable custom logic via PC software (Configurator SF-C)
- 8 safety inputs (2×4), 4 safety outputs plus 4 auxiliary non-safety outputs
- Muting function including exit-only muting option
Detailed Parameters
| Safety Category / PL | ISO 13849-1 Category 4, PLe |
| SIL | IEC 61508 SIL3 / IEC 62061 SILCL3 |
| Supply Voltage | 24 V DC +10/-15% |
| Safety Inputs | 2 x 4 (IN1-IN8) |
| Safety Outputs | PNP open-collector, 2×2 outputs, max. 300 mA/output |
| Response Time | OFF: 10 ms or less; ON: 100 ms or less |
| Auxiliary Outputs | 4 x PNP (non-safety) |