Rockwell-automation 8520-9API 9/Series OCI API Developer's Guide Manuel d'utilisateur télécharger pdf (Page 95)

4–47OCI Data Server Data Items

Publication 8520-6.6 - August 1999

ACTIVE_SCALE_INDICATOR

Data Type DINT (bit pattern)

Read/Write Read only

Array Index none

Control Type Lathe/Mill/Grinder

Grinder Control Type is not available for Release 1 of 9/PC.

The ACTIVE_SCALE_INDICATOR data item is used to identify

which axes on the system are currently being scaled (refer to your

operation and programming manual for details on scaling). The data

for this item is returned as a bit pattern. A true value in any bit

indicates the axis is scaled. The first bit of this word represents axis

For example if the returned integer is 11, which translates into

001011 indicating axes 1, 2 and 4 are scaled.

% I/O Variable

Data Type (defined in ODS I/O assigner)

Read/Write Read - Write (outputs only) (both PAL protected)

Array Index none

Control Type Lathe/Mill/Grinder

Important: % I/O Variable does not apply to 9/PC.

You can access all PAL I/O variables assuming they have been

assigned properly with the ODS I/O assigner. Your OCI application

can read both PAL inputs and outputs. Your OCI application can

write to only PAL outputs. All read and writes are subject to the

PAL logic which always has the authority to override any OCI

settings.

Automatic reads of PAL variables are always added to the controls

background watch list. You must consider any timing issues this

may present in your PAL and API applications.

Variables set by the OCI occur at the beginning of a PAL scan. The

PAL ladder runs and acts on these changes by writing to the variable

tables. This means if your OCI sets an output to true at the

beginning of a PAL scan, PAL can change the output point back to

false during the PAL scan thus overriding the OCI request to set the

output to true.

PAL Variable Data Items

1 2 ... 90 91 92 93 94 95 96 97 98 99 100 ... 262 263

Pas de commentaire

Rockwell-automation 8520-9API 9/Series OCI API Developer's Guide Manuel d'utilisateur Page 95