7 FUNCTIONS
7.6 Protection Function
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7.6 Protection Function
The overload protection function and overheat protection function protect the internal circuit from overcurrent and its heat.
The overload protection function and the overheat protection function do not protect external devices but
protect the internal circuit of the module.
A problem on a load may raise the internal temperature of the module, causing deterioration in output
elements and discoloration on the case and the printed-circuit board. Turn off the corresponding output as
soon as a problem on a load is found, and remove the cause.
Overload protection function
Current is cut off when the IO-Link module detects overcurrent. At that time, the following error codes are generated.
• Overcurrent detected in C/Q cable (error code: 180AH)
• Overcurrent detected in L+ cable (error code: 180CH)
Overcurrent detection values and limited currents are as follows.
• C/Q output: 200mA or more per point
• L+ output: 1.6A or more per point
If the load current becomes equal to the overcurrent detection value or lower, the module returns to normal operation.
Overheat protection function
If high heat is detected in the module, C/Q output turns off and a temperature rise error (160 or more) (error code: 180EH)
occurs.
The overheat protection function operates at each point. If the heat descends, the module automatically returns to normal
operation.
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