[Cause]
Appropriate I/O settings for the stud welding gun have not been made.
[Countermeasure]
On the spot welding device I/O screen, set the DI ‘Gun on robot’ signal ON/OFF and ‘Gun on stand’ signal ON/OFF for 2 guns. Set each signal for each 1 gun to be used as follows.; When using gun 1, the correct settings are: gun １ (Gun on robot=ON, Gun on stand=OFF), gun ２ (Gun on robot=OFF, Gun on stand=ON). When using gun ２, the correct settings are: gun １ (Gun on robot=OFF, Gun on stand=ON), gun ２ (Gun on robot=ON, Gun on stand=OFF).