industrialNETworX

Hi,

please have a look into the SERCOS API manual. This information should be there.

Hello houzenan,

The answer is a little complicated:

1.)
Hilscher SERCOSIII Master and Slave supports the redundancy. Redundancy means that you have an "double ring". You can remove ONE of the cables at any time without disturbing the communication (maybe one bus cycle is broken, but not more).

2.)
If a cable is removed, both affected ethernet ports detects a Link Down. If link down is detected too late, the frames would be sent over a dead port, so it must be detected quickly. The detection time depends on the used Ethernet PHYs. The PHYs used in the netX (netX is used in all Hilscher SERCOSIII products) have a very small detection time (< 25 us). I guess you meant the link down detection time.

3.)
Double ring recovery takes longer as 25 us in any case. How does it works:
The user plugs the missing cable again. Ethernet Link up is detected (takes up to 2 seconds), master detects the changed topology and request from the affected slaves to change the telegram flow (ring healing). Slaves shall do this immediately.
Double ring recovery is not time critical:
User gets a new ethernet cable from the stock (5 minutes)
Master heals the double ring (3 seconds)

Johnny