User Manual Owner's manual

Publication 1757-UM006A-EN-P - May 2002
Integrating Fieldbus into Rockwell Automation Logix System 2-19
Control Mode Interaction
Fieldbus Block Modes Versus Processlogix Modes
Every fieldbus function block including Resource and Transducer
blocks contain the MODE_BLK parameter. This structured parameter
consists of the Actual, Target, Permitted, and Normal modes. Refer
to About Modes of Operation on page 1-8 for descriptions of the eight
modes.
For use within ProcessLogix, the structure of the MODE_BLK
parameter is expanded to add MODE to the existing Actual, Target,
Permitted, and Normal modes as outlined in Table 2.C.
Table 2.D shows how ProcessLogix modes are mapped to fieldbus
ones.
Table 2.C Mode Descriptions
ProcessLogix Mode
Structure
Data Type Description FIM Action
MODE Enumeration Write Only
ProcessLogix style mode enumeration
MAN, AUTO, CAS, NORMAL, BCAS, NONE
The FIM captures all writes to
MODE and maps valid changes to
MODE.TARGET.
MODE.TARGET Enumeration Read/Write
Target mode
OOS, MAN, AUTO, CAS, RCAS, ROUT
If the value NORMAL is written to
the MODE.TARGET, the FIM
replaces it with the value from
MODE.NORMAL.
MODE.ACTUAL Enumeration Read Only
Actual Mode
OOS, IMAN, LO, MAN, AUTO, CAS, RCAS, ROUT
MODE.PERMITTED Bitstring Read/Write
Permitted mode
MAN, AUTO, CAS, RCAS, ROUT
OOS is always permitted
If a new MODE.NORMAL value is
entered, it is validated against
the MODE.PERMITTED values.
MODE.NORMAL Enumeration Read/Write
Normal mode
MAN, AUTO, CAS, RCAS, ROUT
OOS is not Normal
If a new MODE.NORMAL value is
entered, it is validated against
the MODE.PERMITTED values.
Table 2.D Mapping ProcessLogix Modes to Fieldbus
ProcessLogix Mode Fieldbus Mode Comment
MAN Man
AUTO Auto
CAS Cas
NORMAL Normal When setting as target mode, read MODE.NORMAL value and write to MODE.TARGET.
BCAS Error Not used in fieldbus blocks. Attempt to set to target is illegal.
NONE Error Not used in fieldbus blocks. Attempt to set to target is illegal.