Web page that accesses register

Register as seen through Modbus TCP/IP

Momentum I/O Values page

40001 hex

400101 (shadow)

The input buffer scheme captures a snapshot of all input data.

The output buffer scheme insures that the newest copy of output data is written to the output modules. A special algorithm is also used to insure old data is not lost, during a single word update of a multiple word output buffer field.

New in the Momentum 170ENT11001’s output registers are shadow registers that allow read/write access of I/O data at 400101. The result of writing to 400101 is the same as writing to 400001.

Starting reference 400001 is used to address input data from field inputs and output data to field outputs. Data is transferred in the IEC format. Mapping between the controller’s data registers and I/O base field terminals is unique to each base, and the mapping is described in the Momentum I/O Base User Guide (870 USE 002).

At 400101 there are a set of registers that shadow the 400001 output register. You may read and writer your output data to this shadow register, and the result of writing to 400101 is the same as writing to 400001.