Rockwell Automation 900 Temperature Controller Communications Functions - Series B - Manual (Page 80)

Publication 900-UM004D-EN-E - July 2010
4-22 Modbus Communications Procedure
• Alarm Latch Cancel
The applicable alarm latch can be cleared with the related information
setting. The setting can be accepted in both setup area 0 and setup area
1. An operation error will occur if communications writing is disabled or
if an EEPROM error occurs.
• Invert Direct/Reverse Operation
Inverting or not inverting direct/reverse operation can be selected with
the related information setting. The setting can be accepted in both
setup area 0 and setup area 1. The related information specifications are
written to EEPROM according to the write mode settings. An operation
error will occur in the following situations:
– When AT is being executed.
– When inverting direct/reverse operation is set for an event input.
– When executed in manual mode.
• Program Start
The simple program function can be reset/started with the related
information setting. The setting can be accepted in both setup area 0
and setup area 1. An operation error will be generated if program start
has been set in the event input.
• Setting Areas
Control operation is executed in setting area 0. In this state, you can
perform operations that are permitted only during control or those that
cause no problems even if control is in progress. These operations
include reading PVs, writing SPs, and change RUN/STOP status.
Setting area 0, however, prohibits operations that affect control,
including writing data at the initial setting level. (Reading setting data is
always allowed.)
In setting area 1, control operation is stopped. In this state, you can
perform operations that are not allowed in setting area 0. These
operations include writing data at the initial setting level.
At power-ON, the Temperature Controller is set in setting area 0. To
move to setting area 1, use the “move-to-setting area 1” command. To
return to setting area 0, turn the power OFF and ON again, or use the
“software reset” command.
Table 4.17
Related
Information Explanation (Initialization Values)
00 Default set values (refer to Chapter 2, Bulletin 900 Communications
Procedures 900-TCx (CompoWay/F) for details.) (These settings are the
same as the ones used when “FACT” is selected for the setting data’s
set value initialization.)