Used to reset a currently stopped program to step 1.
The value of each variable used in the program remains
unchanged.
This signal can be used only in the EXT. SIGNAL mode.
1. The STEP_RST signal should not be input together with
the STROBE, PRG_RST, CYC_RST or DO_RST signal.
Because the ACK signal is used in common, only the first
signal which is input becomes valid and all other signals
become invalid.
2. This signal cannot be used while AUTORUN (automatic
operation mode ON) is set ON.