V01.00 | 2019/12
29
NOTE
The maximum length of the device name is 255 characters according to the specific-
ation. In a Step7 or TIA Portal environment, however, only names with a maximum
length of 127 characters are accepted.
n All device names must be unique.
n Maximum name size: 255 or 127 characters (a...z, 0...9, “-” or “…”)
n Do not use capital letters.
n The name must not begin or end with "-".
n Do not use special characters
n The name must not begin with 0....9 or "port-xyz" (xyz = 0....9).
8.6.4 FSU – Fast Start-Up (prioritized startup)
FSU - Fast Start-Up is not supported by device.
8.6.5 MRP (Media Redundancy Protocol)
The device supports MRP.
MRP is a standardized protocol according to IEC 62439. It describes a mechanism for media re-
dundancy in ring topologies. With MRP, a defective ring topology with up to 50 nodes is detec-
ted and reconfigured in the event of an error. With MRP a trouble-free switch-over is not pos-
sible.
A Media Redundancy Manager (MRM) checks the ring topology of a PROFINET network defined
by the network configuration for functionality. All other network nodes are Media Redundancy
Clients (MRC). In the error-free state, the MRM blocks normal network traffic on one of its ring
ports, with the exception of the test telegrams. The physical ring structure thus becomes a line
structure again at the logical level for normal network traffic. If a test telegram fails to appear, a
network error has occurred. In this case, the MRM opens its blocked port and establishes a new
functioning connection between all remaining devices in the form of a linear network topo-
logy.
The time between ring interruption and recovery of a redundant path is called reconfiguration
time. For MRP, this is a maximum of 200 ms. Therefore, an application must be able to com-
pensate for the 200 ms interruption. The reconfiguration time always depends on the Media
Redundancy Manager (e.g. the PROFINET PLC) and the I/O cycle and watchdog times set here.
For PROFINET, the response monitoring time must be selected accordingly > 200 ms.
It is not possible to use Fast Start-Up in an MRP network.
To Next Page
Loading...
