LIDA 47xLIDA 48xOutput signals One TTL square-wave pulse from each industrial limit switch L1 and L2; “active high” Signal level TTL from push-pull stage (e.g. 74 HCT 1G 08)TTL from common-collector circuit with 10 k − load resistance against 5 V

Interfaces

Permissible load I

Limit Switches

LIDA 400 encoders are equipped with limit switches that make limit-position detection and the design of homing tracks possible. The limit switches are activated by differing adhesive magnets to distinguish between the left or right limit. The magnets can be confi gured in series to form homing tracks. The signals from the limit switches are sent over separate lines and are therefore directly available. Yet the cable has only a very thin diameter of 3.7 mm in order to keep the forces on movable machine elements to a minimum.
aL † 4 mAI
aH † 4 mA Switching times (10% to 90%)Rise timeFall timet
+ † 50 nst
+ † 10 µst
– † 50 nsMeasured with 3 m cable and recommended input circuitryt
– † 3 µsMeasured with 3 m cable and recommended input circuitry Permissible cable length Max. 20 m
s = Beginning of measuring length (ML) 1 = Magnet N for limit switch 1 L1/L2 = Output signals fromlimit switches 1 and 2 Tolerance of the trigger edge: ± 2 mm 2 = Magnet S for limit switch 2 Recommended input circuitry of the subsequent electronicsDimensioning Limit switches LIDA 400 IC
3 e.g. 74AC14R
3 = 1.5 k −

42