EUCHNER EKS FSA with Profibus-DP Interface - Manual (Page 31)

Manual EKS Electronic-Key Adapter Profibus-DP
8.6.3 Reading the serial number
The Electronic-Key read/write contains a unique 8-byte serial number. This number is written by laser during the
Electronic-Key production process and can never be changed or deleted. The serial number is used for secure
distinction of every single Electronic-Key. If you want to use the serial number, it is necessary to completely
evaluate all 8 bytes. The serial number is appended to the freely programmable user data.
The serial number can be read using user data start address byte no. 116 and the number of bytes set to 8 (see
section 8.6.2 Reading/writing any data areas).
8.7 Read-only operation in conjunction with Electronic-Key read-only
In read-only operation a 7-byte long communication message is transferred to the input area of the bus master
on each bus cycle.
Input area of the bus master
Byte no. Description Function
0 Status byte (see below)
1 Execution counter
0 ... 255, the execution counter is increased by 1 for each newly read
Electronic-Key. At a counter reading of 255 the counter is reset to 0.
Using the execution counter, the user can ensure that no Electronic-
Key is accidentally evaluated more than once.
2
: 5 bytes receive data Representation of the contents of the Electronic-Key
6
The following status information is transferred in the status byte:
Status byte
Bit no. Description (active with bit = 1) Function
0 Electronic-Key adapter ready
After successful configuration the Electronic-Key adapter signals that
it is ready via bit no. 0. Readiness should be continuously monitored
by the application.
1 Electronic-Key detected
The detection of a valid Electronic-Key is signaled using bit no. 1.
Using this bit the bus master can detect that new data is available.
2
Reserve
3
4
Operating mode For read-only operation always set to 1.
5 Job status
Bit no. 5 is set on a status change in the EKS diagnostics byte (value
not 00
hex
, see section 8.5). This bit can be monitored by the
application.
6 Job finished Bit no. 6 indicates that a read has been successfully finished.
7 Job in progress Bit no. 7 indicates that a read is currently in progress.
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