7 – 16 HEIDENHAIN Technical Manual TNC 426, TNC 430
7.2.3 Timers
The PLC has over 256 timers, which you control through special markers with
the symbol T. You must define the cycle time of timers T0 to T47 in machine
parameter MP4110.x. One time unit (input value 1 in MP4110.x) corresponds
to the PLC cycle time.
You can start the first 48 timers by setting one of the timers T0 to T47 for at
most one PLC scan (otherwise the TNC restarts the timer with the negative
edge for each additional scan). The TNC reserves the timer with the duration
defined in MP4110.x, and sets the markers T48 to T95 (timer is running) until
the defined duration has expired.
You can also set and start the timers T0 to T47 with Module 9006. Timers T96
to T303 can be started only through Module 9006.
Example:
Start of timer 1
Cycle time in MP4110.1 = 9 (PLC cycles)
Start timer Timer running Machine parameter
T0 T48 MP4110.0
T1 T49 MP4110.1
T2 T50 MP4110.2
T3 T51 MP4110.3
T4 T52 MP4110.4
T5 T53 MP4110.5
T6 T54 MP4110.6
T7 T55 MP4110.7
T8 T56 MP4110.8
T9 T57 MP4110.9
T10 T58 MP4110.10
T11 T59 MP4110.11
T12 T60 MP4110.12
T13 T61 MP4110.13
T14 T62 MP4110.14
T15 T63 MP4110.15
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