PLC-5/250: I/O image addresses

Use an I/O image address to access an input or output bit in the I/O image table. The format of an I/O image address relates the physical location of the data in the I/O chassis to the storage location in the I/O image table. For example: I:017/17.
When you specify an I/O image address:
  • Specify
    I
     for input or
    O
     for output
  • Include a colon (
    :
    ) as a file delimiter, followed by the I/O rack number (00-37 octal)
  • Include the I/O group number (0-7)
  • Include a front slash (
    /
    ) as a terminal delimiter, followed by the terminal number (0-7, 10-17 octal)
The following table shows valid range, internal storage, and adapter status addresses.
To specify the address of a:
Use these parameters:
Where:
Is the:
I/O Image Bit
I:177/17
I
Input (O for Output)
17
2-digit I/O rack number
00-07 for RS module 1
10-17 for RS module 2
20-27 for RS module 3
30-37 for RS module 4
7
I/O group number (0-7)
17
Terminal number (00-07, 10-17)
Internal Storage Bit
IS:001/10
I
Internal storage specifier
S
Storage delimiter
00
Storage number
000-177 for RS1
200-377 for RS2
400-577 for RS3
600-777 for RS4
/
Bit delimiter
10
Terminal number
Adapter Status
AS20:1
A
Adapter status specifier
2
Rack number
00-07 for RS1
10-17 for RS2
20-27 for RS3
30-37 for RS4
:
Delimiter
1
Quarter number (0-3)
You cannot assign invalid rack numbers for a scanner. For example, you cannot use rack numbers 00-07 or 20-37 if the I/O data you want is located within remote scanner 2. The only valid rack numbers for RS2 are 10-17.
The following table shows some I/O image address examples.
Address:
Explanation:
I:177/17
RS2, input rack 17, I/O group 7, terminal 17
IS:001/10
RS1, storage number 001, bit 10
AS20:1
RS3, rack 20, quarter 1
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