BASEstar^tm Open DAS
for Allen-Bradley Data Highway^tm
on Tru64^tm UNIX
Installation and User's Guide

Figure 3-3 shows the structure of a legal Timer or Counter data table address for the PLC-3. Figure 3-4 shows a PLC-3 Timer structure. Figure 3-5 shows a PLC-3 Counter structure.

Table 3-9 shows examples of legal Timer or Counter data table addresses for the PLC-3.

Figure 3-3 PLC-3 Timer and Counter Data Table Address Format

Figure 3-4 PLC-3 Timer Structure

Figure 3-5 PLC-3 Counter Structure

Table 3-9 Example PLC-3 Timer and Counter Data Table Addresses

Example Address	MMS Type1	Description
$TACC20	UNSIGNED_16	Timer 20 accumulated value
CPRE:91	INTEGER_16	Counter 91 preset value
TCTL:20/17	BIT_STRING	Timer 20 Timer Enable bit 2
T20.TD	BIT_STRING	Timer 20 Timer Done bit 2
C5	Structure 3 UNSIGNED_16 UNSIGNED_16 UNSIGNED_16	All of counter 5. Control Preset value Accumulated value