Communication has failed between the primary control and SDC or MDS
The SDC or MDS does not receive any data from the primary control. As the corresponding VL is no longer operated this VL is braked with secure hold
Source and Remedy
Sercos ring for primary control has failed.
Identifier: Fallen or severed optical fibre
Reinstate optical fibre link
Ethernet communication with primary control has failed.
Identifier: The green LED on connector X39 (ETH0) is off or the Link LED on the switch is off.
Check the Ethernet connector on the M drive and at the switch and or replace the Ethernet cable.
ETHERNET connection with control: The ETHERNET switches run in half-duplex operation. This can lead to increased collisions. Automatic configuration of the switches can cause this case.
Identifier: Ethernet switch is configured for half-duplex
Manual setting to full duplex operation.
ETHERNET connection with control: The MAC addresses in the system are not clear. This causes the telegrams to be incorrectly routed, which means loss of telegrams for individual subscribers. [From MDS with the serial number 0114 xxxx the MAX is configured in the serial EEPROM of the controller cassettes by the manufacturer. Problems can occur if several flash cards on an MDS configured in this way are pre-recoded and saved with parameters and are then slotted into an unconfigured MDS.] Check the parameters ID1461 and ID1462. Written together as 6 byte value, each address may only occur once in the ETHERNET.
Replace the controller cassette
OR
Change over the parameterised values of the ID1462
Primary control has failed: The sign-of-life monitoring with the primary control must toggle the handshake bit in the control word within a parameterizable time.
Identifier: Failure of all functions carried out by this primary control.
Check primary control
Sign-of-life monitoring with primary control is incorrectly (too small) parameterised.
Identifier: The parameter 1010 CommTimeout (for MDS) or SIS timeout (for SDC) is incorrectly parameterised.
Set parameter 1010 to correct value.