Rockwell Automation 1746-BTM Barrel Temperature Control Module User Manual - Manual (Page 16)

Publication 1746-UM010B-EN-P - April 2001
1-4 Getting Started
Module Addressing When you enter the module ID in processor configuration (off-line),
the processor automatically reserves the required number of I/O
image table words. In the figure below, that section of the I/O image
table is designated by “slot e”. Its location in the I/O image table is
determined by the module’s slot location “e” in the I/O chassis. Slot
location “e” is a required addressing unit when referring to the
module in ladder logic. For the sample program’s data table layout,
See Table 9.A: BTM201.rss N7 Data Table on page 9-2. See Figure 1.3
for an explanation of the image table addresses
Figure 1.3 .
Response to Slot Disabling By writing to the status file in your modular SLC processor you can
disable any chassis slot. See your SLC programming manual for the
slot disable/enable procedure.
Input response
When the slot for this module is disabled, the module continues to
update its inputs. However, the SLC processor does not read from a
module whose slot is disabled. Therefore, inputs appearing in the
processor image table remain in their last state, and the module’s
updated inputs are not read. When the processor re–enables the
module slot, the current state of module inputs are read by the
controller during the subsequent scan.
Output response
When the slot for this module is disabled, configuration words in the
SLC processor’s output image table are held in their last state and not
transferred to the module. When the slot is re–enabled, output image
table words are transferred to the module during the subsequent scan.
Input Image Table Address Output Image Table Address
I : e . 6 O : e . 6
file type file type
slot slot
word
word
element
delimiter element
delimiter word
delimiter word
delimiter
ATTENTION
!
Always understand the implications of disabling the
module before using the slot disable feature.