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

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Figure 3-24 shows the structure of a legal Timer, Counter, Control, ASCII String, PID Control or Message Control data table address for the PLC-5/250.

> Figure 3-25 shows a PLC-5/250 Timer structure.
> Figure 3-26 shows a PLC-5/250 Counter structure.
> Figure 3-27 shows a PLC-5/250 Control structure.
> Figure 3-28 shows a PLC-5/250 ASCII String structure.
> Figure 3-29 shows a PLC-5/250 PID Control structure.
> Figure 3-30 shows a PLC-5/250 Message Control structure.
> Figure 3-25 shows a PLC-5/250 Timer structure.
> Figure 3-25 shows a PLC-5/250 Timer structure.

Table 3-18 shows examples of legal Timer, Counter, Control, ASCII String, PID Control and Message Control data table addresses for the PLC-5/250.

Figure 3-24 PLC-5 / 250 Timer, Counter, Control, ASCII String, PID Control and Message Control Address Format

Figure 3-25 PLC-5 / 250 Timer Structure

Figure 3-26 PLC-5 / 250 Counter Structure

Figure 3-27 PLC-5 / 250 Control Structure

Figure 3-28 PLC-5 / 250 ASCII String Structure

Figure 3-29 PLC-5 / 250 PID Control Structure

Figure 3-30 PLC-5 / 250 Message Control Structure

Table 3-18 Example PLC-5 / 250 Timer, Counter, Control, ASCII String, PID Control and Message Control Address Formats
Example Address | MMS Type1 | Description
--- | --- | ---
$0T20:0.ACC | UNSIGNED_32 | Timer 0 in file 20 accumulated value
0C91:3.PRE | INTEGER_16 | Counter 91 in file 3 preset value
0T3:20.CTL/31 | BIT_STRING | Timer 20 in timer file 3 Enable bit 2
1R6:0.UL | BIT_STRING | Control 0 in file 6 unload bit 2
0T4:20.TD | BIT_STRING | Timer 20 in file 4 timer done bit 2
1R6:1.LEN | INTEGER_16 | Control 1 in control file 6 length value
0ST16:0.LEN | INTEGER_16 | String 0 in file 16 length value
0ST16:2 | VISIBLE_STRING 3 | String 2 in file 16
0ST16:3 | OCTET_STRING 3 | String 3 in file 16
0PD17:2.DVDB | FLOAT | PID Control 2 in file 17 Deviation Alarm Dead Band
0PD17:2.EN | BIT_STRING | PID Control 2 in file 17 Enable
0PD17:1.ADDR[0] | INTEGER_16 | PID Control 1 in file 17 Master-to-slave address 0
0MSG18:3.RLEN | INTEGER_16 | Message Control 3 in file 18 Requested Length
1T0:5 | Structure 4 UNSIGNED_16 UNSIGNED_32 UNSIGNED_32 | All of timer 5 in file 0 Control Preset value Accumulated value
0R8:10 | Structure 4 UNSIGNED_16 INTEGER_16 INTEGER_16 | All of control 10 in file 8 Control Length Position
0PD17:0 | Structure 4 UNSIGNED_32 FLOAT FLOAT FLOAT FLOAT FLOAT FLOAT FLOAT FLOAT FLOAT FLOAT FLOAT FLOAT FLOAT FLOAT FLOAT FLOAT FLOAT FLOAT FLOAT FLOAT FLOAT FLOAT FLOAT FLOAT Array of 4 UNSIGNED_16 Array of 14 FLOAT | All of PID Control 0 in file 17 Control Set point Proportional gain Initial gain Derivative gain Output bias % Maximum scaled value Minimum scaled value Dead band Set output % Maximum output limit Minimum output limit Update time Process variable Error:scaled Output PV alarm high PV alarm low Deviation alarm + Deviation alarm - PV alarm dead band Deviation alarm dead band Maximum input Minimum intput Tieback % Master-to-slave address Reserved/internal use
0MSG18:2 | Structure 4 UNSIGNED_16 INTEGER_16 INTEGER_16 INTEGER_16 Array of 52 INTEGER_16 | All of Message Control 2 in file 18 Control Error code Requested length Done length Reserved/internal use

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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