Verify-Read; Calculationoftheaveragevalue (Analog Submodule) - Siemens SIMATIC S5 Equipment Manual

General Function Description

1.10 Verify-Read

This special function is used to eliminate brief disturbances (e.g., on the encoder line),
The basic module reads the actual value of the matching encoder submodule. Immediately after
this read access, the actual value is read again, and compared with the value first read in. If equal,
calculation is continued with this value. If not equal, reading is continued until the values are equal,
or until the maximum number of test read procedures (15) is reached. The last value is then pro-
cessed as the valid value.
Channel no: 1 or 2
The function is selected with transfer of F2, and deselected with transfer of F2 and "number of test
read accesses = O".
Verify-read should only be used for higher encoder frequencies. This function is not suitable for
the BCD/dual matching encoder module.
1.11 Calculation of the Average Value (Analog Submodule)
This special function calculates the average value of up to 15 consecutive actual values and
should only be used with the analog submodule.
Channel no: 1 or 2
The function is selected with transfer of F3, and deselected with transfer of F3 and "number = O".
1) This function is implemented as of firmware release R09. The standard function blocks sup-
port the special function starting with the release states given in the technical specifications
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Entry in Byte (Module Address +n)
Number of test read
accesses: O to 15
Entry in Byte (Module Address +n)
Number: O to 15
R 02/92
F2
n = 4
F3
AG 1989, Order No: 6ES5 998-0KD21
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