Rockwell Automation GMLC Reference Manual - Manual (Page 429)

Publication GMLC-5.2 - November 1999
392 DH-485 Blocks
Multiple Variables
The specified number of values—starting with the specified DH-485
remote element—is read from the remote device. The values are stored in
an equal number of contiguous elements in a local DH-485 data file in the
motion controller starting with the specified DH-485 or CNET local
variable. Contiguous elements in the remote file are read, not contiguous
items in the DH-485 Remote list. Likewise, the values read are stored in
contiguous local elements, not contiguous items in the DH-485 Local list.
You do not have to define all the DH-485 remote elements—only the first.
You do not have to define all the DH-485 local elements used to store the
read values to successfully read multiple elements. However, any local
elements whose values are required by the GML Commander diagram
must be defined as DH-485 Local variables to allow access via the
Equation block and the Expression Builder.
The maximum number of contiguous remote elements which may be read
using a single DH-485 Value block depends on the file type selected for
the element in question. See DH-485 Message Details for the limits for
each file type.
The specified number of values (starting with the specified DH-485 local
element) is sent to the remote device. The values are sent to an equal
number of contiguous elements of the data file in the remote device,
starting with the specified DH-485 remote element. Contiguous elements
in the remote file are sent, not contiguous items in the DH-485 Local list.
Likewise, the values are sent to contiguous remote elements, not
contiguous items in the DH-485 Remote list.
You do not have to define all the DH-485 local variables—only the first.
Nor do you have to define all the DH-485 remote elements used to store
the values to successfully send multiple elements. However, any local
elements whose values are required by the GML Commander diagram
must be defined as DH-485 Local variables to allow access via the
Equation block and the Expression Builder.