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4
FUNCTIONS
4.1 Dual Input Function
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CHAPTER 4 FUNCTIONS
Table 4.1 shows the list of safety relay module functions.
4.1
Dual Input Function
This function doubles safety inputs to prevent damage of the safety functions due to a
single failure.
The doubled safety inputs operate after making sure that the internal module, external
devices, and wiring are normal by the start-up/off check function, Briefly, if a module,
external devices or wiring has a failure, the module does not start.
After module start-up, if one safety input does not turn OFF due to a failure, the output is
cut off by turn-OFF of the other safety input.
single failure.
The doubled safety inputs operate after making sure that the internal module, external
devices, and wiring are normal by the start-up/off check function, Briefly, if a module,
external devices or wiring has a failure, the module does not start.
After module start-up, if one safety input does not turn OFF due to a failure, the output is
cut off by turn-OFF of the other safety input.
Figure 4.1 Dual input wiring
Table 4.1 Function list
Function
Description
Reference
Dual input function
Prevents damage of the safety functions due to a single failure by doubling
inputs.
inputs.
•Input N type: Dual input with positive common and negative common
•Input P type: Dual input with positive commons
•Input P type: Dual input with positive commons
In case of input N type, when between dual inputs shorts, a short occurs
between the power supply and grounding, resulting in power-OFF with
electric fuse.
Start-up/off check function
Checks that status of the safety relay module and external device are normal.
Start-up method selection function
Allows to select the start-up method either auto mode or manual mode with
the start-up mode setting switch.
the start-up mode setting switch.
Safety output function
Prevents incorrect output due to a single failure by doubling safety relay
contacts internally.
contacts internally.
Monitor function
Allows to check operating status of the whole safety relay modules including
extension safety relay modules by connecting with the programmable
controller using programming tool.
extension safety relay modules by connecting with the programmable
controller using programming tool.
Partial shutdown function with
extension module
extension module
Allows to shut off only the outputs of certain modules by using safety inputs of
extension module.
extension module.
COM0
COM1
X0
Two inputs
One signal
Verification
Safety relay module
X1