HEIDENHAIN MANUALplus 620 Technical Manual page 1522

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8.4.3 Timers and counters

Settings in the configuration editor

[Key name of the timer]

The PLC has 999 timers, which you control through special markers with the

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

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.

HEIDENHAIN Technical Manual MANUALplus 620