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Reference material
5.6 Circuit programs
LOGO!Soft Comfort Online Help
402 Operating Instructions, 11/2017
Blocks in the sense of nesting depth are:
Basic functions (Page 235)
Special functions (Page 241)
Further inputs/outputs according to the nesting depth are:
Inputs AS-Interface (Ia (Page 27))
Outputs AS-Interface (Qa (Page 27))
LOGO! restricts the nesting depth for your circuit program. Your circuit program has a
maximum nesting depth of 58 objects.
This determines the following:
1 input + 56 blocks +1 output
Max. depth of a circuit program = 58 objects
During a simulation or download, the system returns an error message if you enter a
program in LOGO!Soft Comfort that exceeds the maximum nesting depth.
Implementing large circuit programs
You can implement large circuit programs by means of signal recursion. You implement
signal recursion by appending a flag block (Page 221) to the end of the program and
connecting the remaining blocks to the output of the flag block. LOGO! interprets the flag as
the output of the first program and also as the terminal block of the downstream blocks.
LOGO! interprets the large program with flag as two separate programs. If no more flags are
available, you can use an output block instead.
5.6.3
Blocks and block numbers
5.6.3.1
Blocks
Blocks represent terminals or functions. LOGO!Soft Comfort distinguishes between various
types of block and identifies them by means of an abbreviation:
Block type
Identifier
Input
I
Output
Q
Shift register bit
S
Status 1 (high) Hi
Status 0 (low)
Lo
Open connector X
Cursor key
C
Function
B
LOGO! TD function key
F
Flag
M
Analog input
AI
402


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