Communication blocks
Function Blocks - FM 458-1 DP
2-7
Edition 12.2004
CTS
DP module name, connector of the Profibus DP interface
(Initialization connection)
SLA
Diagnostics data required from the slave with the appropriate
station number (3 to 123)
(Initialization connection)
(Default: 3)
LEN
Number of the device-related diagnostic bytes; this means the
diagnostics bytes which extend beyond the Standard diagnostics.
Here, a maximum value of 234 may be set. Whether device-related
diagnostics data is available and, if yes, which significance they
have, should be taken from the user documentation of the relevant
DP slave.
(Initialization connection)
(Default: 0, i.e. only
Standard diagnostics, not
device-related diagnostic
bytes)
EN
Block enable. If EN=0, the block is not processed;
output OK=0 and YTS=1, the last value remains at the other
outputs.
(Default: 1)
OK
Diagnostics data valid
(Default: 0)
ST1
Status 1 of the diagnostics according to the Standard (byte 1).
For a more detailed description, refer to the user manual
"FM 458-1 DP", chapter "Configuring", section "PROFIBUS DP
coupling".
(Default: 0)
ST2
Status 2 of the diagnostics according to the Standard (byte 2).
For a more detailed description, refer to the user manual
"FM 458-1 DP", chapter "Configuring", section "PROFIBUS DP
coupling".
(Default: 0)
ST3
Status 3 of the diagnostics according to the Standard (byte 3).
For a more detailed description, refer to the user manual
"FM 458-1 DP", chapter "Configuring", section "PROFIBUS DP
coupling".
(Default: 0)
MPA
Master Profibus address (byte 4 of the diagnostics according to the
Standard)
ID
Identification number of the slave
(bytes 5 and 6 of the diagnosics according to the Standard)
D01
to
D59
Device-related diagnostic bytes; 4 bytes are combined in one
32-bit
word. Bytes 7, 8, 9 and 10 of the diagnostics telegram can be
found
in D01.
For a more detailed description, refer to the user manual
"FM 458-1 DP", chapter "Configuring", section "PROFIBUS
DP
coupling".
When data is entered at LEN, this has an influence on the
update
of the outputs. For LEN=0, these outputs are not updated.
For LEN=234, D01 up to and including D59 are updated.
Comment:
Bytes 1 to 6 of a diagnostics telegram for PROFIBUS DP
corresponds to the Standard Diagnostics; bytes from 7 onwards
depend on the particular slave (referred to the particular device).
(Default: 0)
QTS
Block output QTS is used to display whether the block is operating
error-free (QTS = 1) or was de-activated after a communications
error message was entered (QTS = 0).
(Default: 0)
I/O
