Parameter Declaration Data type Description
LEN* OUT BOOL Length of the received telegram in byte 1 ≤ LEN ≤ 1024
STATUS* OUT WORD Specification of the error on ERROR = 1
*) Parameter is available until the next call of the FB.
n With the signal state ”1” at parameter EN_R, the software checks whether data can
be read by the CP. A data transmission operation can run over several program
cycles, depending on the amount of data involved.
n An active transmission can be aborted with signal state ”0” at the EN_R parameter.
The aborted receive request is terminated with an error message (STATUS).
n Receiving is deactivated as long as the EN_R parameter shows the signal state ”0”. A
running request may me cancelled with R = "1" then the FB is reset to the basic state.
Receiving is deactivated as long as the R parameter shows the signal state ”1”.
The FB 7 has a mechanism for startup-synchronization between CPU and CP, which is
automatically executed at the first call of the FB. Before the CP can process an activated
request after the CPU has changed from STOP to RUN mode, the CP CPU start-up
mechanism must be completed. Any requests initiated in the meantime are transmitted
once the start-up coordination with the CP is finished.
A minimum pulse time is necessary for a signal change to be identified.
Significant time periods are the CPU cycle time, the updating time on the
CP and the response time of the communication partner.
n The NDR output shows ”request completed without errors/data accepted”. If there
was an ERROR, the corresponding event number is displayed in the STATUS. If no
error occurs the value of STATUS is "0".
n NDR and ERROR/STATUS are also output in response to a RESET of the FB. In the
event of an error, the binary result BR is reset. If the block is terminated without
errors, the binary result has the status "1".
n Please regard the parameter NDR, ERROR and STATUS are only available at one
block call. For further evaluation these should be copied to a free data area.
With LADDR the address of the corresponding CP is specified. This is the address, which
was specified by the hardware configuration of the CP. Please regard that the base
address for input and output of the CP are identical.
The FB 7 - P_RCV_RK deals with an Instance DB I_RCV_RK. This has a length from
60byte. The DB no. is transmitted with the call. It is not allowed to access the data of an
instance DB.
10.1.7 FB 8 - P_SND_RK - Send to CP 341
Please note that this block can only be used in CPUs from VIPA or in
S7-300 CPUs from Siemens!
Release and cancel a
request
Mechanism for startup
synchronization
Error indication
Addressing
Data area
Description
VIPA SPEED7
Serial Communication
Serial communication > FB 8 - P_SND_RK - Send to CP 341
HB00 | OPL_SP7 | Operation list | en | 18-30 217
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