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LOGO! Manual
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* Depending on the parameterization of the function with or
without retentivity, each function occupies the following
amount of memory:
Retentivity switched off: RAM memory
Retentivity switched on: REM memory
The maximum number of functions that can be used
Based on the memory requirements of the individual
special functions, you can work out the maximum
number of special functions you can use.
Example: The operating hours counter requires 2 memory
areas for desired value storage (Par) and 4 memory areas
for the actual values that have to be retained (REM). There
are 15 REM memory areas and 48 Par memory areas In
LOGO!.
The special function of the operating hours counter can
therefore only be used a maximum of 3 times, leaving just
3 REM memory areas left. Although there are still 42 Par
memory areas free, you are one REM memory area short
to run an additional operating hours counter.
Calculation: Free memory areas divided by the required
number of memory areas. Carry out this calculation for
each memory area required (Par, RAM, timer, REM). The
lowest value shows you the maximum number of functions
you can use.
Nesting depth
A program path consists of a series of function blocks
starting and ending with a terminal block. The number of
blocks in a program path describes the nesting depth.
Inputs and levels (I, Ia, hi, lo), as well as outputs and mark-
ers (Q, Qa, M) are terminal blocks . The terminal blocks
are not represented by a block symbol in LOGO!.
The maximum number of function blocks you can use in
LOGO! is 56, so the maximum nesting depth is:
56 function 2 terminal blocks = 58.
Programming LOGO!
