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This is old "Heimer" plant for beton mixing. Control electronic - logic is build on these chips (particularly looking for FZH291, FZH305, FZK101). No microcontrollers. Looking for extended information about these chips because of possibility to replace them with modern designs.
If anybody has functional schematic, pinouts, truth tables, logic... for these chips.
If anybody has functional schematic, pinouts, truth tables, logic... for these chips.