BASEstartm Open DAS
for Allen-Bradley Data Highwaytm
on Tru64tm UNIX
Installation and User's Guide


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Figure 3-43 shows the structure of a legal Timer, Counter, Control or ASCII String data table address for the SLC.

Figure 3-44 shows a SLC Timer structure.
Figure 3-45 shows a SLC Counter structure.
Figure 3-46 shows a SLC Control structure.
Figure 3-47 shows a SLC ASCII String structure.

Table 3-29 shows examples of legal Timer, Counter, Control and ASCII String table addresses for the SLC.

Figure 3-43 SLC Timer, Counter, Control and ASCII String Data Table Address Format


Note

ASCII string is available only on SLC 5/03 Series C with OS301 and SLC 5/04 Series A with OS400.

Figure 3-44 SLC Timer Structure


Figure 3-45 SLC Counter Structure


Figure 3-46 SLC Control Structure


Figure 3-47 SLC ASCII String Structure


Table 3-29 Example SLC Timer, Counter, Control and ASCII String Data Table Address Formats
Example Address MMS Type1 Description
$T20:0.ACC UNSIGNED_16 Timer 0 in file 20 accumulated value
C91:3.PRE INTEGER_16 Counter 91 in file 3 preset value
T:20.CTL/15 BIT_STRING Timer 20 in the default timer file (4) Enable bit 2
R6:0.UL BIT_STRING Control 0 in file 6 Unload bit 2
T4:20.TD BIT_STRING Timer 20 in file 4 Timer Done bit 2
R:1.LEN INTEGER_16 Control 1 in the default control file (6) Length value
ST16:0.LEN INTEGER_16 String 0 in file 16 Length value
ST16:2 VISIBLE_STRING 3 String 2 in file 16
ST16:3 OCTET_STRING 3 String 3 in file 16
T:5 Structure 4
UNSIGNED_16
UNSIGNED_16
UNSIGNED_16
All of timer 5 in file 4
Control
Preset value
Accumulated value
R8:10 Structure 4
UNSIGNED_16
INTEGER_16
INTEGER_16
All of control 10 in file 8
Control
Length
Position


1Arrays are not supported for structures other than ASCII strings.
2Control bits should be treated as read only and modified only under PLC program control. Modifying these bits from a computer can give unpredictable results.
3Only Varying length strings are supported.
4Write operations are not allowed to structures other than to ASCII strings.


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