S5-115F Manual Analog Value Processing
6.9 Analog Value Matching Blocks FB 250 and FB 251
These blocks match the nominal range of an analog module to a standard range that you can
specify.
Reading in and scaling an analog value - FB 250 -
Analog input modules convert analog process signals into digital values and store them in the
module. From there they are transferred cyclically to the CPU memory and also transferred to the
other subunit.
The FB 250 ANEI function block enables two types of access to the analog value:
• Access to the cyclically updated CPU memory
or
• Direct access to the memory of the analog input module.
EWA 4NEB 811 6148-02
6-37
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