Siemens Simatic Ident Function Manual page 140

Appendix
A.2 Cyclic data
Command termination with "SRESET"
The "SRESET" command cancels execution of the command currently being processed. It is
transferred from block (controller) to block (reader/optical reader) by means of cyclic
communication (control and status word). Handshake is performed via "SRESET" and
"Soft_Reset_Active". After the "SRESET" block parameter is set, the block assigns the
control to the control bit "Soft_Reset". During this time, the execution of "RD_REC" and
"WR_REC" cannot be interrupted. This means that the assignment process can only take
place after execution of "RD_REC" or "WR_REC" is complete.
A prerequisite for the "SRESET" command is that the command and acknowledgment
counter are initialized within the block (reader/optical reader) and the status word. "SRESET"
does not have an effect on the sequence number (SN within the frame header).
a
Figure A-3
140
CC_H/CC_L = 1, AC_H/AC_L = 0
Defined reset
Time sequence of "SRESET"
Ident profile and Ident blocks, standard function for Ident systems
Function Manual, 10/2018, C79000-G8976-C387-04