FAQ
Rotary Encoders - Modbus TCP
1.
Q: Why can’t we set the Preset value more than one time?
A: The Preset value will be saved in the flash of the encoder. This flash has only written cycles of 100000 times. If the register 14+15 is in use to set the Preset value it could be that thousands of cycles will be safe in the flash and the lifetime of the encoder decreases significantly. So, we fixed it that it is not possible to save the same preset value for more than one time. The next preset value must be different but can be used in the next but one. I.e. Preset value is 0. Then set in the first time 0, in the second 1, in the next one 0, ...
2.
Q: With which PLC can the encoder work too?
A:SEND/RECEIVE is an easy open protocol, that can be used by different PLC's like Siemens (S7-1200), Hima, ...
3.
Q: How to solve physical zero-point problems?
A: You can set only the Preset value. The offset value is only the result. If you would like to set the encoder position to the half of physical resolution you must do the following steps:
- Set preset value to a value so that the offset value is zero.
- Rotate the shaft i.e. to 16777216.
- Set the Preset value to the wished value.
4.
Q: What are the minimum sensors update time?
A: The internal sensor updates time amounts ~2 ms. Temporary the update time was between Version 4.2 and 4.5 only 10 ms. But this fast transmission time is only possible with UDP. According to the basic of TCP-IP and the network traffic this product cannot guarantee real time applications.