Siemens SIMATIC S5 Manual page 62

Start-Up, Tests, and Diagnostics
Test Possibilities during Start-Up
The S5-95U provides the two following types of diagnostics functions:
• Functions for the general diagnostics of the SINEC L2 bus
• Functions for diagnostics of the specific data transmission types (standard connection, PLC-to-
PLC, cyclic I/O, layer 2 services)
The functions for diagnostics of the different data transmission types are explained in the
corresponding chapters.
The functions for the general diagnostics of the SINEC L2 bus are explained in the following:
List All the Operative Active Stations of the Network
FMA service LAS_LIST_CREATE (see section 3.4.5)
Find Out the Status of a Remote Station
FMA service FDL_STATUS (see section 3.4.6)
You can find out whether another station is operative and passive or active.
Calculate the Remaining Token Hold Time When Receiving the Token
FMA service TIME_TTH_READ (see section 3.4.8)
You can find out whether the set target rotation time is optimal (TRT parameter in DB1).
Locate Errors
FMA service MAC_EVENT (see section 3.4.9)
Examples of errors that can be located using this service:
• Two stations have the token (double token).
• A station address has been assigned twice.
• There is a short-circuit on the bus cable.
Startup Procedure for the SINEC L2 station
Proceed as follows to start up the SINEC L2 station:
Start up the PLC without the SINEC L2 interface (as described in the S5-90U/S5-95U System
Manual, chapter 4).
Start up the SINEC L2 interface as shown in the flowchart of Figure 3-6.
Prerequisite: The SINEC L2 bus connector is not plugged into the interface port on the PLC.
3-8
S5-95U, SINEC L2
EWA 4NEB 812 6112-02