EUCHNER EKS FSA with Profibus-DP Interface - Manual (Page 9)

Manual EKS Electronic-Key Adapter Profibus-DP
The connection to the system is made using the integrated Profibus-DP interface. The Electronic-Key adapter is
connected to the field bus as a subscriber (DP slave) using a standard Profibus cable. The Electronic-Key
adapter can thus also be used remotely from the controller, e.g. at assembly workstations.
Setup and system integration can be realized very straightforwardly and quickly on the Electronic-Key adapter
with Profibus-DP interface. The bus address is simply set at the Electronic-Key adapter and the device data file
(GSD file) loaded into the bus master. The transmission protocol complies with Profibus-DP according to
DIN EN 50170. The system automatically synchronizes itself to the data transfer rate of the bus master. The
data is available in the input area of the bus master immediately after connection.
Two transfer messages are supported based on the Profibus-DP SRD and SND transfer services:
f Program (write) Electronic-Key read/write
f Read
Electronic-Key
The current state of the Electronic-Key adapter is displayed using a 3-color LED. If an error is detected when
the Electronic-Key is written or read (e.g. due to premature removal of the key from the Electronic-Key adapter
or a faulty key), the LED flashes red for approx. 5 s. After this, the LED is illuminated green again and the
Electronic-Key adapter is again ready for use.
The Electronic-Keys are tag-shaped. The complete transponder without batteries with memory chip and
antenna is integrated into the Electronic-Key.
For operation, the Electronic-Key is inserted in the Electronic-Key adapter and is held in place by a spring clip.
The power supply for the transponder and the data are transferred without using any contacts between the
Electronic-Key adapter and Electronic-Key.
Figure 2: Cut-away illustration of Electronic-Key adapter with Electronic-Key inserted
The data carrier in the Electronic-Key is equipped with a combined memory:
f 116 bytes E²PROM (programmable) plus 8 bytes ROM (serial number)
On Electronic-Keys read/write with 116 bytes, the memory is organized in 4-byte blocks. This means a multiple
of 4-byte sized blocks must always be written.
3.1.2 Additional functions of the version EKS FSA
The version EKS FSA has two additional semiconductor relay outputs (LA1/LA2 and optionally LB1/LB2) that
are switched off as long as there is no Electronic-Key in the Electronic-Key adapter or if it is not possible to read
the Electronic-Key.
The semiconductor relay outputs are electrically isolated from the device electronics and from each other. Either
AC or DC can be switched.
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