Panasonic FP0-A21 Technical Manual page 4

Expansion Limit and Compatibility FP0 A/D Converter Unit
Expansion Limit and Compatibility
Expansion limit
The unit can be connected to a combined maximum of three other expansion units and
intelligent units.
Compatibility with the previous FP0 analog unit (FP0−A21)
Due to differences in the software design, the programming method is different.
ii