S5-95U, SINEC L2 DB1 Parameters, DB1 PAFE, TRT
Explanation of the SET, ST, SDT1, and SDT2 Parameters
* One bit time unit is the time it takes to transmit one bit (reciprocal value of baud rate)
Parameter Explanation
Set up time (SET) “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*
Slot time (ST) Wait-to-receive time or wait-to-reply time; this is the length of time the
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*
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Shortest station
delay time (SDT1)
Shortest protocol processing time; this is the shortest 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: 11 to 255 bit time units*
Longest station
delay time (SDT2)
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*
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
H
” is in the right byte as the error location for SL2: SINEC L2
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)
Significance
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3
H
Syntax error in block ID
4
H
Syntax error in parameter
5
H
Syntax error in argument, or value goes upside permissible
range
6
H
Value exceeds permissible range in an argument
7
H
Parameter combination not allowed
17
H
L2 interface not in working order
20
H
A flag byte has been assigned twice for the status bytes
EWA 4NEB 812 6112-02
A-7
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