Allen-Bradley 1770-M11 User Manual download pdf (Page 20)

20 SLC 500™ Chassis–Based Processors

Publication 1747-2.39

Application Specific Instructions

Communication Instructions

Proportional Integral Derivative Instruction

Instruction Mnemonic

and Name

Execution Times (µs)

Function -

Output Instructions

SLC 5/01 SLC 5/02 SLC 5/03

SLC 5/04

SLC 5/05

BSL Bit Shift Left

BSR Bit Shift Right

144 + 24

per word

89 + 14

per word

50 + 2.30

per word

31.5 + 2.31

per word

On each false–to–true transition, these

instructions load a data bit into a bit array, shift

the pattern of data through the array, and

unload the end bit of data. The BSL shifts data

to the left and the BSR shifts data to the right.

SQO Sequencer Output 225 137 70 44.1

On each false–to–true transition, these

instructions load a data bit into a bit array, shift

the pattern of data through the array, and

unload the end bit of data. The BSL shifts data

to the left and the BSR shifts data to the right.

SQC Sequencer

Compare

225 137 60 33.2

On successive false–to–true transitions, the

SQC moves a step through the programmed

sequencer file, comparing the data through a

mask to a source word or file for equality.

SQL Sequencer Load — 135 56 33.2

On successive false–to–true transitions, the

SQL moves a step through the sequencer file,

loading a word of source data into the current

element of the sequencer file.

Instruction Mnemonic

and Name

Execution Times (µs)

Function -

Output Instructions

SLC 5/01 SLC 5/02 SLC 5/03

SLC 5/04

SLC 5/05

MSG Message Read/

Write

— 180 203 183

This instruction transfers data from one node

to another on the communication network.

When the instruction is enabled, message

transfer is pending. Actual data transfer takes

place at the end of the scan.

SVC Service

Communications

— 240 240 200

When conditions preceding it in the rung are

true, the SVC instruction interrupts the

program scan to execute the service

communication portion of the operating cycle.

Instruction Mnemonic

and Name

Execution Times (µs)

Function -

Output Instructions

SLC 5/01 SLC 5/02 SLC 5/03

SLC 5/04

SLC 5/05

PID Proportional

Integral Derivative

— 3600 272 169.82

This instruction is used to control physical

properties such as temperature, pressure,

liquid level, or flow rate of process loops.

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