Why is my ProfiSAFE encoder data slower than my actual device configuration?
ProfiSAFE Encoders - For Safety Applications!
Kevin
Last Update a year ago
- Testing ProfiSAFE Application:
After creating a module or device in your safety project, testing your ProfiSAFE application is crucial.
- Data Transmission Speed:
Calculate how quickly the encoder data is sent to the PLC during testing.
- Network Factors:
Various network factors can impact the speed of data transmission.
- Overlooked Factor - Cyclic Interrupt Cycle Time:
One often overlooked factor is the cyclic interrupt cycle time.
- Effective Troubleshooting:
For effective troubleshooting of update time or scan cycle issues, Connect the encoder directly to the PLC.
- Recommended Practice:
It is always best to connect the encoder directly to the PLC when troubleshooting.
- Update Time Configuration:
The CEV582M series encoder with ProfiSAFE over Profinet allows setting up to a 1ms update time.
- Example Configuration:
Refer to the example configuration screenshot below for setting a 1ms update time.
- When the PLC handles safety data, it uses something called a 'Fail-safe organization block'.
- This block is activated by a regularly occurring event called a cyclic interrupt, and it has a setting for how often it happens.
- If this setting is slower than how often your device updates its information, it may seem like your device's data is moving slower than you expected.
- Screenshot Observation:
In the provided screenshot, focus on the Fail-safe organization block.
- Default Setting:
The default cycle time for this block is set to 100 milliseconds.
- Identifying Bottleneck:
The limiting factor, or "bottle-neck," is the speed of the cyclic interrupt within the function block.
- Consideration for Data Transmission Speed:
When determining the required data transmission speed for your application, Be mindful of this cycle time in the function block.