machine a signal must be received from the shift register 44 through line 54 and a signal must be directed from switch 60 along the line 62 to the and circuit 64 the switch 60 senses when the machine 10 is running whenever signals appear at the same time along lines 54 and 62 the and circuit 64 produces an output signal which through triac 52 in line 66 activates the electric stop motion 50 either directly or indirectly to stop operation of the machine the stop motion when activated deactivates the main motor not shown which drives the knitting machine when a signal from the shift register 44 is directed to the and circuit 64 the latch 68 provided to store information also activates the rundown indicator light 70 which signals to an operator the particular reason for the machine shutdown the main warning light 72 also will be on indicating to an operator that the machine needs attention if the machine is stopped by an operator no indicator lights will be on after the operator has corrected the problem and the machine restarted rundown indicator light 70 will go off however the main warning light will remain on until the rundown detector 18 has 34 seen 34 a predetermined number of revolutions of.