One SF-C21 can do the work of four safety relay units.
Simple to wire the units in the control panel!!

Small, so the unit can be installed in a narrow space
Compact with a height 97 mm 3.819 in × width 45 mm 1.772 in.
It's easy to find installation space for the SF-C21 unit.

Easy to monitor status with a generalpurpose PLC
Four auxiliary outputs (PNP semiconductor output) are provided.
Using RS-485 communications (MODBUS RTU), various general-purpose control units (PLC, HMI, etc.) can monitor the SF-C21 information such as the status, the selected logic, and any error status.

Simply turn a switch to set
Eight preset logics, safety-certified and compatible up to control category 4 PLe, can be selected by simply turning the rotary switch.

Easy to create a reliable safety circuit Use our "Configurator SF-C" software to build your own safety circuits of connected devices, control logic, output modes, etc. No programming skills required!

Customized logics are safety-certified too!!
All possible logic combinations created with the "Configurator SF-C" software are already safety-certified by the certification bodies. The software also has a "simulation mode" to test if the prepared logic and safety circuit operates as intended. If the logic is not complete, the software will block its transfer to the SF-C21 unit.

Note:
Please read the instruction manual in advance when selecting or creating logics, and verify whether the combination of connecting devices and logics complies with each machine safety standard.

When any connected input becomes OFF, the entire control output will be OFF.

*1 The delay time can be set using the Configurator SF-C.
*2 The initial OFF delay is set to 0 seconds.

When the muting input becomes ON, the light curtain will be temporarily disabled.

*1 The delay time can be set using the Configurator SF-C.
*2 The initial OFF delay is set to 0 seconds.

Only when the muting input becomes ON following a predefined sequence, the light curtain will be temporarily disabled.

*1 The delay time can be set using the Configurator SF-C.
*2 The initial OFF delay is set to 0 seconds.

When the emergency stop input is OFF, the entire control output will be OFF. When any other input is OFF, its corresponding control output will be OFF.

*1 The delay time can be set using the Configurator SF-C.
*2 The initial OFF delay is set to 0 seconds.

When the emergency stop input or the input from the back-end process becomes OFF, the entire control output will be OFF. When the input from the front-end process becomes OFF, only its corresponding control output will be OFF.

*1 The delay time can be set using the Configurator SF-C.
*2 The initial OFF delay is set to 0 seconds.

This control is applied when a two-hand operation switch is used for control.Only when both switches of the two-hand operation switch are operated within 0.5 sec., control output will be ON.

*1 The delay time can be set using the Configurator SF-C.
*2 The initial OFF delay is set to 0 seconds.

Even when the guard (input A) is OFF, if the enabling switch is ON the control output will be ON. If either the emergency switch or input B becomes OFF, the entire control output will be OFF regardless of the status of the input A and emergency switch.

*1 The delay time can be set using the Configurator SF-C.
*2 The initial OFF delay is set to 0 seconds.

Only when mode selection using the key selector is followed by the enabling switch being turned ON, the control output will be ON regardless of the open / close status of the guard.
Note that if the emergency stop switch is OFF, the entire control output will be OFF.

*1 The delay time can be set using the Configurator SF-C.
*2 The initial OFF delay is set to 0 seconds.