Data Suffixes for Tag I/O Addressing
The data type to read from or write to is usually implied by the address. If it is not, the strings shown in the following table may be appended to the address (without spaces) to force the data to be interpreted as a specific type. Not all suffixes apply to all drivers.
| Suffix | Meaning |
|---|---|
| /AB3Float | Allen-Bradley PLC/3 Floating Point (4 bytes) (Used for Allen-Bradley exclusively) |
| /AB5Float | Allen-Bradley PLC/5 Floating Point (4 bytes) (Used for Allen-Bradley exclusively) |
| /BCD2 | 2-digit (1 byte) Binary Coded Decimal |
| /BCD3 | 3-digit (2 bytes - lowest 12 bits) Binary Coded Decimal |
| /BCD4 | 4-digit (2 bytes) Binary Coded Decimal |
| /BCD8 | 8-digit (4 bytes) Binary Coded Decimal Note: while any driver may use this suffix to read data, only the Modbus Compatibly can use it to write data. |
| /Bit | Attempts to convert the value to a single bit. The bit number used is always 0. (ex: 40001/Bit) |
| /Double | IEEE Double Precision Floating Point (8 bytes) |
| /Float | IEEE Single Precision Floating Point (4 bytes) |
| /SByte | Signed Byte |
| /SDWord | Signed 32-bit Integer. If used in combination with /Bit, /SDword comes last: example: 40001/0/SDWord |
| /SWord | Signed 16-bit Integer |
| /UByte | Unsigned Byte |
| /UDWord | Unsigned 32-bit Integer |
| /UWord | Unsigned 16-bit Integer |
For example:
40001/UDWord
Each I/O device uses a different addressing system. Details can be found in the following topics:
Allen-Bradley Driver I/O Addressing
MDS Diagnostic Driver I/O Addressing
Modbus Compatible Device I/O Addressing
Motorola ACE Driver I/O Addressing
OPC Client Driver I/O Addressing
