Bradley Smoker PLC-5 user manual 24Communicating with Remote I/O, Defined I/O status file, N1547

Models: PLC-5

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6-24Communicating with Remote I/O

Addressing the I/O Status File

During program execution you can address words and fault bits within the I/O status file. The following figure shows the arrangement of the words in the I/O status file for a given remote or extended local I/O rack. The example status file used for the figures in this section is integer file 15.

Defined I/O status file

Word in integer file

N15:0

N15:1

N15:14

N15:15

N15:30

N15:31

rack 0

rack 3 (Maximum for PLC-5/11, -5/20, and -5/20E)

rack 7 (Maximum for PLC-5/30 processors)

rack 17 (Maximum for PLC-5/40, -5/40L, and -5/40E processors)

N15:46

 

 

 

 

rack 27

(Maximum for PLC-5/60, -5/60L,

 

 

 

 

N15:47

 

 

 

 

 

 

 

-5/80 and -5/80E processors)

 

 

 

The first word for a rack contains present and fault bits, the second word contains reset and inhibit bits. The following figure shows present, fault, reset, and inhibit bit layouts for rack 7 in the I/O status file.

 

Setting inhibit bits in the I/O status file does not update

IMPORTANT

inhibit bits in the controller status file.

 

 

 

 

Publication 1785-UM012D-EN-P - July 2005

Page 96
Image 96
Bradley Smoker PLC-5 user manual 24Communicating with Remote I/O, Defined I/O status file, N1547