GENERAL NOTES
SUMMARY OF XSF FLAGS
XSF1 - Allows the auto introduction of P1 at the start of AØ
GENERAL OPERATION
If in AØ clear demands for CØ.
SIGNAL GROUP OPERATION
Signal Group 4 - Red Arrow Drop-Out Operation
SG4 operates green-yellow-red in CØ and can switch to blank in AØ.
SG4 goes red at the start of SG2 in AØ and remains red in BØ.
If going to AØ with NO demand for P1, hold SG4 red until the end of AØ late start period.  At the end of the late start period SG4 red is switched off.
If going to AØ with a demand for P1, hold SG4 red in AØ for the duration of Timer 1, which starts timing at the start of P1 Walk, using Special Purpose Timesetting No. 9.  When Timer 1 expires, SG4 red is switched off.
AØ ECO is used to guarantee SG4 minimum blank period.  Timer 2 starts timing at the start of SG4 blank period using Special Purpose Timesetting No. 10.  When Timer 2 expires, expire AØ ECO.
PEDESTRIAN GROUP OPERATION
Pedestrian 1
P1 calls AØ.
P1 can introduce at the start of AØ.
P1 auto introduces at the start of AØ when XSF1 is set.
Pedestrian 2
P2 calls BØ.
P2 can introduce at the start of BØ.
DETECTOR OPERATION
Detector 7
Detector 7 places non-locking calls for CØ when presence timer expires.
OPERATION OF ILLUMINATED SIGNS
Operation of illuminated give way to pedestrian signs
Special Output No. 1 / P8 wait state (SO1/WS8) drives a LED “Give Way To Peds” sign during P2 walk and clearance.