What is the difference between the IBSM and IBSM PLUS?
• The old IBSM only used an 8 bit buffer for the backplane interface with the PLC. This sometimes results in the PLC reading 1/2 of a register while the IBSM is updating the other half which may result in bogus data being transfered. This problem is most pronounced when analog values are near the 255 or 256 value and is usually not a problem with discrete bit I/O. The IBSM PLUS fixes this problem by using a full 16 bit backplane interface that ensures data word integrity across the backplane.
