Communication blocks
2-16
Function Blocks - FM 458-1 DP
Edition 12.2004
CTS
The configured name of its own CPU is specified
at this initialization input.
CDM
Specifies the coupling status
(faulted = 0, not faulted = 1).
(default: 0)
QTS
Operating status of the function block
There is an irreparable fault for QTS = 0, for QTS
= 1,
the function block operates error-free.
(default: 0)
Computation time [µs]
FM 458-1 DP
16,5
Available online
no
Can be configured in
Cyclic tasks
Executed in
Normal mode
Initialization mode
Special features
-
2.3.2 S7RD_P Reading data from a SIMATIC-CPU (P Bus)
S7RD_P
Offs in 128By-PBus-Buffer
―
I OFF PTR
DW
―
PtrBuffer Transmitdata
Number bytes to be read
―
I LEN QF
BO
―
Error-Status Block
Enable
―
BO EN
YF
W
―
StatusInfo Block
This block can only be used for the SIMATIC application module FM 458-
1 DP.
A SIMATIC-CPU can transfer up to 128 bytes to the FM 458-1 DP in its
output area of the P bus. Block S7RD_P reads this data from the P-Bus
and provides it, via its pointer interface, to the read blocks (DRD…,
CPY_Y) for further processing in the CFC configured software.
This block operates similar to the telegram block CRV_P. A maximum of
128 bytes can be accessed via the pointer interface. These bytes are
sent from the SIMATIC-CPU to the FM 458-1 DP via the P bus.
Data can be read using the read blocks (DRD…) or the copy block
(CPY_P).
This block only communicates with a SIMATIC-CPU. This means that the
required byte or
word swap
operations are automatically made
(depending on the data type of the connected read/write blocks). The
entry, which is normally required at the SW-connection of the read/write
block, is not evaluated and is therefore not required.
I/O
Configuringdata
Symbol
Brief description
Mode of operation
