Configuring
4.2 Configuring the CPU
CPU 1516pro-2 PN (6ES7516-2PN00-0AB0)
Operating Instructions, 09/2016, A5E35873416-AA
45
Isochronous mode interrupt OBs
In synchronous cycle interrupt OBs you use the "SYNC_PI" and "SYNC_PO" instructions to
update the process image partitions. Additional information on isochronous mode interrupt
OBs is available in the STEP 7 online help.
Direct I/O access to the inputs and outputs of the module
You also have direct read and write access to the I/O, as an alternative to access via the
process image, should direct access be required for programming reasons. A direct (write)
I/O access also writes the process image. This prevents the situation where a subsequent
output of the process image overwrites the value written via direct access again.
Additional information on process image partitions is available found in the function manual,
Cycle and response times (https://support.industry.siemens.com/cs/ww/en/view/59193558
).
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