Reading The Status Of Another Station (Fdl_Status) - Siemens SIMATIC S5 Manual

S5-95U, SINEC L2
3.4.6

Reading the Status of Another Station (FDL_STATUS)

The FDL_STATUS service delivers information about the status of another station on the network
(remote service).
Structure the FDL_STATUS request
block as follows:
Request Block
Byte
0 com_class
FMA-Request=00
(service request)
1 user_id
Freely assignable ID. That ID is returned
unchanged in the confirmation.
2 service_code
Type of service requested:
FDL_STATUS=22
3
irrelevant
4 irrelevant
irrelevant
5
rem_add_station
6
Address of target station
(TLN=1 to 126)
7
irrelevant
Relevant
parameters
Figure 3-12. Structure of the FDL_STATUS Request and Confirmation Blocks
link_status
Table 3-6. link_status Messages for the FDL_STATUS Confirmation
link_status Message
00
H
15
H
EWA 4NEB 812 6112-02
H
H
ok (okay): Positive confirmation, FDL_STATUS was read out
iv (invalid): The following errors may have occurred:
- Local station is passive, service is not possible
- Target station address is own address
- Target station address is higher than 126
Start-Up, Tests, and Diagnostics
The data are stored in the FDL_STATUS
confirmation block as follows:
Confirmation Block
Byte
0 com_class
FMA-Confirmation=01
(acknowledgment from firmware following
FMA_Request)
1
user_id
ID assigned in the FMA_Request
2
service_code
Type of service provided:
FDL_STATUS
3 link_status
4-5
irrelevant
6
rem_add_station
Address of target station
(TLN=1 to 126)
7
irrelevant
8
Status byte for remote station
Significance
H
= 22
H
3-19