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SYNAX
The fieldbus interface Profibus
Process data length
5-15
FBControl /
FBStatus
S
00 0F
acknowledge idle state
M
97 00
read request
S
91 18
answer (length = 24 bytes)
Fig. 5-18: Read process data length
Participant address
FBControl /
FBStatus
S
00 0F
acknowledge idle state
M
57 00
read request
S
51 63
answer (address = 99)
Fig. 5-19: Read participant address
Indramat SIS format
The "Indramat SIS format“ transmission format is needed for phase
progressions and the "abort" service. (Theoretically, a transmission of A
and C and S and P parameters in SIS format is also possible, but the
short format 1 has been designed for this.)
The SIS telegram is broken down into blocks of up to five words which
are transmitted with the help of the fieldbus control and status words.
The general structure of Indramat SIS format is described in section
"Data storage protocol (SIS protocol)". This is why this section restricts
itself to telegrams for phase transitions and terminate services.
Note:
The CLC only acknowledges the receipt of phase progression
requests. To detect whether the transition has been properly
executed or not, the current mode must be polled until the
target phase is reached, an error is displayed in the status
byte or a timeout has run out.
The reaction telegram
It is necessary to differentiate between three cases for the CLC's reaction
telegram, namely,
• transmission without fault,
• faulty transmissions with error in the PK protocol shell and
• faulty transmission with error message in the SIS telegram.
Transmission without fault
Given an error-free transmission, the error bit in the FB status word is
cleared (E=0) and possible requested data are following at word offset 2
Faulty transmission with error
in the PK protocol shell
Given a faulty transmission with an error in the PK protocol shell, the
CLC sets the error bit in the FB status word and sends a telegram in the
following format:
Word 1
Status word
Fieldbus
control
DOK-SNAX*-SY*-06VRS**-FK01-EN-P
Word 2
Parameter no.
Word 3
Error
class
0x06
0x00
Word 4
Additional error
code
Error message
Word 5
Ctrl
Status