Siemens SIMATIC S5 Manual page 194

S5-95U, SINEC L2
Explanation of the SET, ST, SDT1, and SDT2 Parameters
Parameter
Set up time (SET)
Slot time (ST)
Shortest station
delay time (SDT1)
Longest station
delay time (SDT2)
* One bit time unit is the time it takes to transmit one bit (reciprocal value of baud rate)
DB1 Parameter Assignment Errors
You can read out the DB1 parameter assignment errors as codes. All you need to do is to specify
in DB1, parameter block "ERT:", where to store the error code (in the flag area or in a data block).
The error code is in the left byte; "04
parameter block. Parameter assignment for "ERT:" is described in detail in section 9.1.2 of the S5-
90U/S5-95U System Manual.
Error Code of DB1
Interpreter (left byte in data
word or flag word)
3
H
4
H
5
H
6
H
7
H
17
H
20
H
EWA 4NEB 812 6112-02
"Dead time"; this is the time allowed to pass between the occurrence of
an event (e.g., the receipt of a character or expiration of an internal timer)
and the response to this event.
Permissible range: 0 to 494 bit time units*
Wait-to-receive time or wait-to-reply time;
transmitter of a frame must wait for the receiving station to respond. This
is valid for a data frame as well as for a token frame.
Permissible range: 50 to 4095 bit time units*
Shortest protocol processing time;
between transmission(receipt) of the last bit of a frame and transmission
(receipt) of the first bit of the next frame.
Permissible range: 11 to 255 bit time units*
Longest protocol processing time; this is the longest span of time between
transmission(receipt) of the last bit of a frame and transmission (receipt) of
the first bit of the next frame.
Permissible range: 35 to 1023 bit time units*
" is in the right byte as the error location for SL2: SINEC L2
H
Syntax error in block ID
Syntax error in parameter
Syntax error in argument, or value goes upside permissible
range
Value exceeds permissible range in an argument
Parameter combination not allowed
L2 interface not in working order
A flag byte has been assigned twice for the status bytes
DB1 Parameters, DB1 PAFE, TRT
Explanation
this is the length of time the
this is the shortest span of time
Significance
A-7