Installation manual

Publication 1747-RM001G-EN-P - November 2008

1-8 Processor Files

Control Data File (R6:)

These instructions use various control bits. These are 3-word elements, used

with bit shift, FIFO, LIFO, sequencer instructions, and ASCII instructions

ABL, ACB, AHL, ARD, ARL, AWA, and AWT. Word 0 is the status word,

word 1 indicates the length of stored data, and word 2 indicates position. This

is shown in Table 1.10.

In the control element, there are eight status bits and an error code byte. A

fixed controller and an SLC 5/01 control element has six bits. Bits EU and

EM are not used by the processor.

C5:0/11 or C5:0/UN Underflow bit

C5:0/10 or C5:0/UA Update accum. bit (use with HSC in fixed controller only)

C5:0.1 or C5:0.PRE Preset value of the counter

C5:0.2 or C5:0.ACC Accumulated value of the counter

C5:0.1/0 or

C5:0.PRE/0

Bit 0 of the preset value

C5:0.2/0 or

C5:0.ACC/0

Bit 0 of the accumulated value

Table 1.9 Counter File Addressing Format

Explanation

Table 1.10 Three Word Element Structure

15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 Word

(1)

ER UL IN FD Error Code 0

Length of Bit Array or File (LEN) 1

Bit Pointer or Position (POS) 2

(1)

Not used in Fixed or SLC 5/01.

Table 1.11 Control Elements

Addressable Bits Addressable Words

EN = Enable LEN = Length

EU = Update Enable POS = Position