Peter,
Input strip plugged back on.
Rotating, slowly the MPGs, one at a time it is possibly to see four state, Corresponding to the LEDs of the MPG signal reflected in the most significant digit, first digit, of I= display. eg 30, 70, B0, F0
And C0, D0, E0 F0
Information/state ok at input just not there at 1155
S1 also works for input from one of the MPGs
Regards Peter