GENERAL OPERATION
20
PAC Considerations
12/22/94- RD 3196-10
PAC
Considerations
PLC initialization can access both RDCI and GETN blocks. The only
difference between these blocks is the way each uses the battery backed up
memory (NVRAM – nonvolatile random access memory). The RDCI block
immediately writes directly to nonprotected NVRAM. The GETN block does
not automatically write to NVRAM. Changes made to GETN values will be
lost on drive power down unless a "save to NVRAM" procedure is executed
(function 994). GETN values are saved to "protected" NVRAM. A hardware
slide switch on the DSD board must be on to allow this save. See the DSD
manual for more information. VCD 703 drives do not have "protected"
NVRAM, so the execution of F994 would save all GETN values to
"nonprotected" NVRAM.
The PAC programmer will need to know how PLC initializations fit into the
overall handling of drive setup parameters in the PAC diagram. Just as the
PLC initialization table allows the PLC to access drive setup parameters
(function number values), the RDU initialization table allows an RDU access
to these functions. Figure 11 expands the Figure 9 example to show a remote
display (RDU) initialization table.
Figure 11. Sample PAC Diagram
300-E
TO OTHER CIRCUITS IN THIS
DRIVE'S PAC DIAGRAM
F# 115 MASTER LINE SPD
RDCI
FCTN
115
0 0
DESC
UNIT
MAX
MIN
DFLT
TYPE
BLCK
SCAN
DP
P
S
REMOTE DISPLAY LIST
Node Chan Menu
No. No. Item
103 5 6 115 MASTER LINE SPD 0 RDCI
FCTN DESCRIPTION DP
Block
Type
PLC INITIALIZATION
PLC PLC In PLC In PLC Out PLC Out FCTN DP DESCRIPTION
Node Chan Item Chan Item
200 120 1 020 1 115 0 MASTER LINE SPD
HEADER
PAC SOURCE HEADER
LAN ID:
DRIVE NAME:
PRODUCT CLASS
SCAN A RATE
1
LEAD DRIVE
312_V9 _R1
0.0
Gre eting1:
THIS MAGNETEK DSD (DIGITAL SYSTEMS DRIVE) IS POWERED UP AND READY
Gre eting2:
THERE ARE NO FAULTS TO REPORT AT THIS TIME
MASTER_LINE_SPD FPM
10000 0
1000
RDCI 300
E
