Extended instructions
9.3 Distributed I/O (PROFINET, PROFIBUS, or AS-i)
S7-1200 Programmable controller
414 System Manual, V4.2, 09/2016, A5E02486680-AK
The instruction has the following operating modes:
● Check whether the I-device has a request for making a data record available
● Transfer the requested data record to the higher-level controller
● Sending an answer to the higher-level controller
You can determine the operating mode executed by the instruction using the input parameter
MODE (see below).
The I-device must be in the RUN or STARTUP mode.
Enter the maximum number of bytes the data record to be sent should have with LEN. The
selected length of the target range RECORD should have at least the length of LEN bytes.
If a request to make a data record available exists, (MODE = 0), the output parameter NEW
is set to TRUE.
If the request for making a data record available is accepted, write RECORD for the positive
answer to the higher-level controller with the requested data record and write zero for
CODE1 and CODE2. If the request for making a data record available is to be rejected, enter
the negative answer to the higher-level controller in Error Code 1 of the CODE1 and in Error
Code 2 of the CODE2.
-device has received a request for making a data record available, you must recognize
the delivery of this request within a certain time period. After recognition, you must send an
answer to the higher
-level controller within this time period. Otherwise, the I-device
experiences a timeout error which causes the operating system of the I
-device to send a
negative answer to the higher
-level controller. For information on the value for the time
period, refer to the specifications of your CPU.
The STATUS output parameter receives the error information after the occurrence of an
error.
To Next Page
Loading...
