1522 HEIDENHAIN Technical Manual MANUALplus 620
8.4.3 Timers and counters
Timers The PLC has 999 timers, which you control through special markers with the
symbol T.
T0 to T47 are reserved as start markers for the timers, T48 to T999 are
reserved as process markers.
The key name of the timer is freely selectable in the machine configuration.
The process marker (e.g. T48) is defined with the optional machine parameter
MP_run. If no value is entered in MP_run, the control uses the key name of
the timer as process marker.
You must define the run times of the timers in machine parameter MP_value.
As the time unit, under MP_unit you can choose between seconds and PLC
cycles.
You start the first 48 timers by setting one of the timers with the process
markers T0 to T47 for at most one PLC scan (otherwise the control restarts
the timer with the negative edge for each additional scan). The control
reserves the timer with the duration defined in machine parameter MP_value
and sets the process marker until the defined duration has expired. A change
of the default value for a PLC timer only becomes effective after a PLC
program restart.
The optional machine parameters MP_start and MP_gate are not evaluated
by the control. The PLCdesignNT development environment uses them for
the automatic generation of PLC definition files.
You can also set and start timers T0 to T47 with Module 9006 (see "Module
9006: Set and start PLC timer" on page 1530).
Timers T96 to T999 can only be started through Module 9006.
Cyclic timers (> T96) can be defined and started with Module 9197 (see
"Module 9197 Start cyclic timer" on page 1531). They are reset for one PLC
cycle, and are then restarted automatically.
Settings in the configuration editor MP number
System
PLC
CfgPlcTimer
[Key name of the timer]
run
start
gate
unit
value
103503
103504
103505
103501
103502
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