If I use a Momentum PLC with an 984 exec on a discrete I/O base, will the inputs and outputs be 16-1 (MSB-LSB) or 0-15(LSB-MSB)?
All bases are IEC. The issue is whether you choose to map the base as a discrete (0X,,1X ) or a word (3X,,4X). If mapped as a discrete, it will be 16-1(MSB-LSB) on the pins. If mapped as a word, it will be 0-15(LSB-MSB) on the pins. For modules with less than 16 bits check the manual for starting and ending points.