C6 Safety PLC and Safety I/Os

Safety functions in innovative industrial systems will become increasingly important in future in order to ensure the highest safety standards for people and machines. This means that in new machine generations, the flexible programming of additional safety functions is increasingly being relied upon in order to survive on the future-oriented market.

The C6 Safety PLC as a safety controller and the C6 Safety I/O module handle all safety-related tasks at control level and can also be integrated into an existing EtherCAT structure. Communication is carried out via the existing EtherCAT bus with the certified Safety over EtherCAT (FSoE) safety protocol. Any FSoE slaves (for example Safety I/O modules, KEB’s drive controller with a safety module) can be operated via the Safety PLC (FSoE master).

The freely programmable Safety PLC and the Safety I/O module comply with the requirements of safety standards IEC 61508 SIL 3 and DIN EN ISO 13849-1 PLe. The safety PLC has a double-channel design and is programmed using the COMBIVIS studio 6 programming tools which include the certified functional safety modules. For the user, this means reduced development work and minimised testing and approval of the created safety application.



  • Freely programmable Safety PLC (IEC 61508 SIL3 and DIN EN ISO 13849-1 Ple) 
  • Certified safety function modules 
  • Substantial reduction in time spent on development, verification and approval of a safety application 
  • Programming by means of CODESYS Safety via the main controller and EtherCAT connection


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Technical Data

C6 Safety PLC and Safety I/O

C6 Safety PLC

Safety protocol FSoE
Safety standardIEC 61508 SIL3 and DIN EN ISO 13849-1 PLe
ApprovalsCE, cULus, TÜV Rheinland
Runtime systemCODESYS RT Safety
Programming toolCODESYS Safety integrated from COMBIVIS studio 6 V3.6.4.1
E-Bus power consumption240 mA
Power supplyVia E-Bus connection
Resistance to interferenceEN 61000-6-2 / EN 61000-6-4
Resistance to vibration/shockEN 60068-2-6 / EN 60068-2-27
Signal displayStatus LEDs (EtherCAT, Safety, Power)
Ambient conditions0° C … +55° C, IP 20
HousingAluminium carrier, exterior plastic 25 x 120 x 90 mm

C6 Safety I/O

Safety protocol FSoE
Safety standardIEC 61508 SIL3 and DIN EN ISO 13849-1 PLe
Number of inputs4 safe inputs 
Number of outputs2 safe outputs  (IMAX = 2)
Cycled outputs (OSSD)4
Reaction time< 1 ms (read input, write to E-Bus)
Fault reaction time≤ Watchdog time (adjustable)
Extended diagnosticsvia COE
Signal displayLEDs per I/O: spatially assigned to the terminal point
Status LEDs (EtherCAT, Safety, Power)
E-Bus power consumption300 mA
Power supply 24 V DC (-15 % / +20 %)
Resistance to interferenceEN 61000-6-2 / EN 61000-6-4
Resistance to vibration/shockEN 60068-2-6 / EN 60068-2-27
ApprovalsCE, cULus, TÜV Rheinland
Ambient conditions0° C … +55 °C, IP 20
HousingAluminium carrier, external plastic 25 x 120 x 90 mm


(zip, 06.02.2017, 2 MB)
Manual C6 I/O Safe-In4 / Safe-Out2
(pdf, 21.12.2017, 6 MB)
Manual C6 Safety PLC
(pdf, 21.12.2017, 4 MB)
Functionally safe system solutions for machines and plants are based on a consistent architecture up to the mechanical interface.
Kristin Gabel | 29.10.2020