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3.3.3 PLC-5 Addressing Syntax and Supported Data Types
This section describes legal data table addresses and data types for
the 1785 PLC-5 family. For information on addresses and supported data
types for the PLC-5/250 PLC, refer to Section 3.3.4.
The structure of a legal data table address for the PLC-5 differs depending on the table that is being addressed. The PLC-5 supports the following data table sections:
I - Input
O - Output
S - Status
B - Binary
T - Timer
C - Counter
R - Control
N - Integer
F - Floating-Point
A - ASCII
D - Decimal
ST - String
SC - SFC Status
BT - Block-Transfer Control
TD - Token Data
PD - PID Control
MG - Message Control
Figure 3-10 shows the structure of a legal I/O data table address for the PLC-5.
Table 3-13 shows examples of legal I/O data table addresses for the PLC-5.
Figure 3-10 PLC-5 I/O Data Table Address Format
| Example Address | MMS Type1 | Description |
|---|---|---|
| I:20 | UNSIGNED_16 | Input image rack 2 group 0 octal |
| I:277 | INTEGER_16 | Input image rack 27 group 7 octal |
| I:177/17 | BIT_STRING | Bit 17 of rack 17 group 7 octal |
| $O:77/1 | BIT_STRING | Bit 1 of rack 7 group 7 octal |
| I:0 | Array of 10 UNSIGNED_16 | Ten words beginning at rack 0 group 0 |
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