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4 Safety Function Blocks
NX-series Safety Control Unit Instructions Reference Manual (Z931)
4
SF_ESPE
• This FB monitors electro-sensitive protective equipment (ESPE). The function is the same as that of
the SF_EmergensyStop instruction. As soon as the S_ESPE_In input is set to FALSE, the
S_ESPE_Out output is set to FALSE. If the S_ESPE_In input is set to TRUE and the function is
reset, the S_ESPE_Out output signal is set to TRUE. Enabling the reset is determined by the defined
S_StartReset, S_AutoReset, and Reset inputs.
•If S_AutoReset is TRUE, the confirmation operation is performed automatically.
•If S_AutoReset is FALSE, a change to TRUE in the Reset input must be made for enable confirma-
tion.
•If S_StartReset is TRUE, the confirmation operation is performed automatically when the Safety CPU
Unit first starts.
•If S_StartReset is FALSE, a change to TRUE in the Reset input must be made for enable confirma-
tion.
• Activate the S_StartReset and S_AutoReset inputs only when you can ensure that no hazardous
state will occur as the result of starting the Safety CPU Unit.
• ESPE must be selected for the category that is required according to product standards IEC/EN
61496-1, IEC/EN 61496-2, IEC/EN 61496-3, and EN ISO 13849-1.
Function