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Lenze · Controller-based Automation · EtherCAT® Communication Manual · DMS 6.4 EN · 04/2014 · TD17 161
11 Defining the cycle time of the PLC project
11.1 Determining the task utilisation of the application
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
How to determine the task utilisation:
Initial situation: A complete project, e.g. with a EtherCAT task and 2 lower priority tasks has
been created.
1. For a first measurement of the task utilisation, set the cycle times of all cyclic tasks
available in the PLC system "high" (e.g. EtherCAT task = 10 ms, all other cyclic
tasks = 20 ms).
2. Use the menu command Online Login, or log in on the Lenze Controller with <Alt>+<F8>.
• For this, the PLC program must be error-free.
• With the log-in, the fieldbus configuration and the PLC program are loaded into the
Controller.
3. Reset the values displayed on the Monitor tab of the Task Configuration to 0 after the
complete run-up of the system.
Execute the Reset command from the context menu of the task name field.
4. Read the displayed maximum computing time of the task with the highest priority.
In the illustration above, the max. cycle time of the EtherCAT task is 647 μs.
The minimum cycle time (T
min
) for a system can be calculated by means of the formula:
T
min
= Task utilisation x safety factor
Note!
A safety factor of 1.5 should be included in the calculation.
- Controller-based 1
- Automation 1
- Contents 2
- 1 About this documentation 10
- Pictograph and signal word! 12
- Danger! 13
- 1) In preparation 16
- ( 36) 17
- 4.1.2 Communication 19
- Operational 20
- Pre-Operational 20
- Safe-Operational 20
- 4.1.2.3 Working counter 23
- 4.2.1 Field devices 24
- 4.2.3 EtherCAT product codes 26
- 4.3 Lenze Engineering tools 29
- PLC State of the PLC 30
- 5Technical data 34
- ( 87) 36
- 6.1 Synchronous communication 37
- 6.2 Test of DC synchronicity 38
- »PLC Designer« online help 59
- 7 Commissioning of the system 100
- 8.1 CANopen and EtherCAT 107
- Drives 9400 108
- 8.3 EtherCAT and PROFINET 109
- • Error case: 113
- 9.2 CoE Interface 115
- ( 115) 120
- SDO Download Response 123
- 9.2.2 L_ETC_CoE_SdoRead (FB) 125
- Outputs (VAR_OUTPUT) 126
- 9.2.3 L_ETC_CoE_SdoRead4 (FB) 127
- Inputs (VAR_INPUT) 130
- 9.2.5 L_ETC_CoE_SdoWrite (FB) 131
- 9.3 Device Interface 137
- 9.3.1 ETCSlave (FB) 137
- 9.3.2 L_ETC_GetSlave (FUN) 138
- 9.3.3 L_ETC_IoControl (FUN) 139
- 9.3.4 L_IODrvEtherCAT (FB) 140
- 9.4 Diagnostic Interface 141
- 9.4.1 L_ETC_GetEmergency (FB) 141
- 9.4.4 L_ETC_ReadErrCnt (FB) 145
- 9.4.5 L_ETC_ResetErrCnt (FB) 146
- 9.5 FoE interface 147
- 9.5.1 L_ETC_FoE_Read (FB) 147
- 9.5.2 L_ETC_FoE_Write (FB) 149
- 9.6 State Machine Interface 151
- 9.7 Data types 155
- 9.7.1 L_ETC_COE_EMERGENCY 155
- 9.7.3 L_ETC_COE_FLAGS 155
- 9.7.4 L_ETC_DIAGNOSTIC 156
- 9.7.6 L_ETC_ERRORCODE 157
- 9.7.7 L_ETC_IOCTLOPARMS 157
- 9.7.8 L_ETC_LANGUAGE 157
- 9.7.9 L_ETC_SLAVE_PORTS 157
- ( 160); 160
- ( 162) 160
- How to optimise the system: 162
- 12 Diagnostics 163
- 13 Parameter reference 196
- )(('%$& 204
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