3-14
3.17:
Type
F17
External
Digital
Input
States
QLength: 1 Register (2 bytes)
QThis register has two bytes. Each byte has eight bits. The bits in the Least significant byte are
associated with the eight External Digital Inputs in an External Digital Input Module, the most
significant bit with input 8, through to the least significant bit with Input 1. The most significant
byte is undefined.
QAbit value of 1 means the input is open; a bit value of 0 means the input is closed.
Example:
Register 02774, Digital Input States, Module 1, might contain the following data:
Address
Value
Bytes
Bits
Input
Meaning
Interpretation
00H
00000000
Undefined
87654321
Closed Open Closed Open Closed Closed Closed Open
87654 3 21
02774
0051H
51H
01010 0 01
External Digital Input States
Inputs 7, 5 and 1 are open; all other inputs are closed.