Rockwell Automation 900 Temperature Controller Communications Functions - Series B - Manual (Page 77)

Publication 900-UM004D-EN-E - July 2010
Modbus Communications Procedure 4-19
– When the mode is switched from RAM write mode to backup mode,
the parameters in the Operation/Adjustment function groups
(excluding read-only parameters) are written to EEPROM.
– The RAM write mode is enabled only when the Communications
Writing parameter is set to ON (enabled).
Consequently, when the Communications Writing parameter setting
is changed to OFF (disabled), the parameters in the
Operation/Adjustment function groups (excluding read-only
parameters) are written to EEPROM even if the RAM write mode is
set to Disabled.
· RAM Data
This command writes the parameters in the Operation/Adjustment
function groups (excluding read-only parameters) to EEPROM. The
setting can be accepted in both Setup Area 0 and Setup Area 1.
· Software Reset
Restarts processing from the point when power is turned ON. The
setting can be accepted in both Setup Area 0 and Setup Area 1.
· Move to Setup Area 1
This command moves to Setup Area 1 and can be accepted at both
Setup Areas 0 and 1. If the Initial Setup/Communications Protection is
set to 2, an Operation Error will be generated, and the move to Setup
Area 1 will be prohibited.
When this move is carried out from Setup Area 0, the display indicates
the Input Type in the Initial Setting function group. When this operation
command is executed in Setup Area 1, the display will not change.
· Move Protect function group
This command moves to the Protect function group and can be
accepted only in Setup Area 0. When this command is issued in Setup
Area 1, an Operation Error will be generated, and the move to the
Protect function group will be prohibited.
Table 4.15
Write Mode Description
Backup mode The data is written to EEPROM when the parameters in
the Operation/Adjustment function groups (excluding
read-only parameters) are written by communications.
RAM write mode The data is not written to EEPROM when the parameters
in the Operation/Adjustment function groups (excluding
read-only parameters) are written by communications.
Parameters can be changed by operating the keys on the
front panel of the controller.