Input Buffer And Output Buffer For Digital Signals; Input Buffer And Output Buffer For Analog Signals - BONFIGLIOLI AGILE Applications Manual

2.7

Input buffer and output buffer for digital signals

Input buffer:
The input buffer is updated and the output buffer is written at a defined point of time. In this
way it is ensured that the processing within a cycle in performed based on the same input data
and inconsistent statuses are avoided.
Output buffer:
For digital outputs (control terminals) of the device, signal sources 2401 to 2404 are available
(corresponds to operation modes 80 ... 83 for digital outputs). Operation modes 2401 to 2416
are available to other functions, e.g. comparators.
At the start of a cycle, the input buffer is read and kept in the memory until the next return
jump. Then, the instructions are processed. The output buffer is written at the end of the cycle
and is available in the global sources after that.
By selective use of the jump function, the input buffer and output buffer can be updated either
separately or jointly. This enables setting the digital output signals at certain times (selected by
the user) during the processing.
Note:
The input and output buffers are set and written during the return jump. This is done in one
processing cycle. The output buffer is written first, after that the input buffer is set.
2.8

Input buffer and output buffer for analog signals

The input buffer is updated and the output buffer is written at a defined point of time. In this
way it is ensured that the processing within a cycle in performed based on the same input data
and inconsistent statuses are avoided.
− Consistent values; values of identical points of time are processed
− Clear arrangement thanks to limited number of signals
− Conversion to percent values; functions process percent values
− Four indices
In order to write an analog output, you will have to select an output buffer first. Then, the sig-
nal must be assigned to the device function.
For analog outputs of the device, the following operation modes are available:
− 61 – "Abs. value PLC outp. percent 1"
− 62 – "Abs. value PLC outp. percent 2"
− 161 – "PLC outp. percent 1"
− 162 – "PLC outp. percent 2"
Based on these values, the input buffer is read at the start of a cycle and kept in the memory
until the end of the cycle. Then, the instructions are processed. The output buffer is written at
the end of the cycle and is available in the global sources after that. When the input buffer is
updated, the output buffer is updated and the cycle restarts.
By selective use of the jump function, the input buffer and output buffer can be updated either
separately or jointly. This enables setting the output signals at certain times (selected by the
user) during the processing.
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VPLC / PLC
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