Technical data

Programming
CPU 317T: Technology Functions
5-2 A5E00251798-03
Control cycles
• OB1 cycle
The length of the OB1 cycle is determined by the number of executed
instructions. The OB1 cycle operated independent on the cycles of the
integrated technology.
• OB 32...35 cycle
The watchdog OBs are called up to one second within a time pattern of 100
ms. The watchdog interrupts are called independent on the clock and cycles of
the integrated technology.
• OB 65 cycle
The technology synchronization interrupt OB is called after each update of the
technology DBs. The technology synchronization interrupt is thus coupled to
the integrated technology.
Cycles of the integrated technology
All cycles of the integrated technology are synchronized with the DP cycle:
• DP cycle
In the configuration in HW Config, you need to enable the constant bus cycle
time at the DP(DRIVE). The integrated technology in combination with the
synchronized components on DP(DRIVE) result in operation with synchronized
cycle. The clock pulses and cycles of the integrated technology are thus
synchronized with the DP cycle.
• Position controller cycle clock
The position controller cycle is used to calculate the position control of the
axes, for example. The value of the position controller cycle can be set in
S7T Config to a multiple of the DP cycle.
• Interpolator cycle
The interpolator cycle is primarily used to calculate control variables.
• Interpolator cycle 2
Interpolator cycle 2 performs the same tasks as the interpolator cycle, and can
be used for low-priority technology objects.
• Update of technology DBs
The update cycle of the technology DB can be set in S7T Config as a multiple
of the interpolator cycle. The technology synchronization interrupt OB is called
after each update of the technology DBs.