13 appendix, 1 timing diagram, 1 explanations – EUCHNER EKS FSA with Profibus-DP Interface User Manual
Page 33: Electronic-key adapter ready, Electronic-key detected, Read/write electronic-key, Manual eks electronic-key adapter profibus-dp
Manual EKS Electronic-Key Adapter Profibus-DP
13 Appendix
The procedure described below is to be followed when reading or writing arbitrary data areas (see section
8.6.2). The bits for the read or write job in the command byte in the output area of the bus master must be
actively set and also reset again by the application.
13.1 Timing diagram
Figure 9: EKS timing diagram
13.1.1 Explanations
Electronic-Key adapter ready
The Electronic-Key adapter must basically be ready (see section 7 Setup). Readiness is signaled automatically
in the input area of the bus master in byte no. 0 (status byte) (see section 8.6.1) by the value 1 in bit no. 0.
Electronic-Key detected
To read user data from the Electronic-Key or to write user data to the Electronic-Key, the Electronic-Key must
be detected. Detection is signaled automatically in the input area of the bus master in byte no. 0 (status byte)
(see section 8.6.1) by the value 1 in bit no. 1.
Read/write Electronic-Key
The job (read or write, start address user data, number of bytes of user data, data contents on writing) is defined
in the output area of the bus master (see section 8.6.2). To start this job, bit no. 6 (read) or bit no. 7 (write) in
byte no. 0 (command byte) in the output area of the bus master must be set to the value 1.
092009-03-10/07
Subject to technical modifications
Page 33
/
36