Memory updating system for field device

A memory updating system for a field device comprising:

• a fieldbus;
• one or more field devices that incorporate a nonvolatile memory and are connected to the fieldbus;
• a host system that is directly or indirectly connected to the fieldbus and transmits an updating instruction and updating data to one of the field devices in order to update the nonvolatile memory of the field device;
• and
• a current control circuit that controls a current provided from the fieldbus,
• wherein the current control circuit increases the current provided from the fieldbus to a value greater than a normal value before the field device erases data stored in the nonvolatile memory, and returns the current provided from the fleidhus to the normal value after the field device completes the erasing of the data stored in the nonvolatile memory, and before the nonvolatile memory of the field device is updated.