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Appendix A
A 10
2.
Determine the nominal block-transfer time.
3.
Compute the approximate scanner time for each block-transfer
channel.
4.
Compute the encoder re-/write-block-transfer time.
Example Computation
An example computation to determine the block-transfer timing with a
PLC-3 family processor follows. The example is based on these facts:
user program contains 20K words
channel 1 contains five I/O chassis with a total of seven block-transfer
modules including one encoder module
channel 2 contains two I/O chassis with no block-transfer modules
channel 3 contains two I/O chassis with one encoder module
channel 4 is made inactive through processor LIST
1.
Diagram the chassis connected in series to each channel (up to four)
of your scanner module. Then, fill in the information called for
below. Example values have been added.
1
2
Scanner
3
4
= I/O chassis
n
= number of block-transfer
modules in chassis
1
1
2
0
0
1
0
Make inactive through processor LIST
1
2
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