YASKAWA SIEMENS CNC Series, Maintenance Manual, Serviceman Handbook

Page: 215 / 373

14.1 Fundamental settings
14-5
14.1 Fundamental settings
At first, fundamental settings to operate each axis are shown as follows.
14.1.1 Control cycle
The following 2 settings specify the control cycle of YS 840DI system.
• DP cycle: Interpolation cycle of CNC and data transmission cycle between CNC and a
drive.
• IPO cycle: Program block analysis cycle of CNC.
IPO cycle must be an integral multiple (
×
1,
×
2, ...) of a DP cycle.
„ DP cycle setting
Currently, you can select 2 ms or 4 ms as a DP cycle.
In YS 840DI system, the following standard values are set.
• Machining center : 0.002 sec (2 ms)
• Turning : 0.004 sec (4 ms)
The DP cycle is set through a hardware configuration using a PLC set-up tool "STEP7".
Refer to STEP7 instruction for more information.
You can check the DP cycle, having been set by the hardware configuration, by using the
following machine data (read-only data).
• MD10050 SYSCLOCK_CYCLE_TIME
Meaning: DP cycle time
Displayed value: [sec]
„ IPO cycle setting
IPO cycle is to be set to an integral multiple of the DP cycle.
You can set IPO cycle using the following machine data.
• MD10070 IPO_SYSCLOCK_TIME_RAITIO ##
Meaning: IPO cycle time
Setting value: Integral multiple of DP cycle
Standard setting value: 2 to 4
• MD19296 ON_PERFORMANCE_INDEX ##
Meaning: Limitation to IPO cycle
Standard setting value: 4