GE GFK0579B user manual Series Six PLC or Series Five PLC, Remote Drop Data in I/O Table Memory

7

Monitoring/Controlling I/O Data:

Series Six PLC or Series Five PLC

For a Series Six or Series Five PLC, I/O data for a remote drop may be configured to use either I/O or register memory. To utilize the data correctly, it is necessary to know the position of each module in the rack, and the amount of input and output data it has. Data lengths are equal to the amounts configured for %I, %AI, %Q, and %AQ. For discrete data, 16 points = 16 I/O references or 1 register. For analog data, 1 channel = 16 I/O references or 1 register.

Input Data Message

(up to 128 bytes)

a

To CPU

discrete inputs	analog inputs
a Configured %I Length '	a Configured %AI Length '

Remote Drop Data in I/O Table Memory

In I/O memory, data from a remote drop is stored beginning at the assigned I/O reference. In the Input Table, the sequence is: discrete inputs then analog inputs. In the Output Table, the sequence is discrete outputs then analog outputs.

For example, a remote drop has:

Htwo 16±circuit discrete input boards (total of 32 input bits)

Hone 4±circuit analog input board (total of 64 input bits)

Hfour 16±circuit discrete output boards (total of 64 output bits)

Htwo 4±circuit analog output boards (total of 32 output bits)

The remote drop's configured data lengths are: %I = 32, %AI = 4 (words), %Q = 48, %AQ = 2 (words). In this example, there are 32 discrete input bits followed by 64 bits from the analog input modules. If the beginning I/O Table Reference Address assigned to the Remote I/O Scanner were 0001, the input data would occupy the references shown below.

I0001 to I0016	=	16 inputs from 1st discrete input module
I0017 to I0032	=	16 inputs from 2nd discrete input module
I0033 to I0048	=	1st input from analog input module
I0049 to I0064	=	2nd input from analog input module
I0065 to I0080	=	3rd input from analog input module
I0081 to I0096	=	4th input from analog input module
POINT #		INPUT	(nickname)

0064

0128

0192

0256

0320

0384

00000000 10111111 00011001 00101010 00011000 01010101 01001001 00101100

11001010 01110100 01010101 11010110 01010010 00010100 11010100 10001101

10100011 00101010 01001010 10101000 01100101 01010011 00101010 01101111

10101001 01010101 10101010 11111001 01111010 10111010 11111111 11111111

01100000 00000000 00000000 00000000 00011010 00011010 00000111 01000000

11111111 11111111 11111110 11000111 11111110 01101010 01100000 00000000

Chapter 7 Remote Drop I/O Data 109