Rockwell Automation 1785 PLC-5 User Manual download pdf (Page 48)

Instruction Set

Relay 3-4

relay instructions continued...

Instruction Description

Immediate Data

Input

IDI

for ControlNet

processors only

If the input conditions are true, an immediate data input is initiated that updates the destination

file from the private ControlNet buffers before the next normal input-image update. The Data file

offset (232) is where the data is stored. The Length (10) identifies the number of words in the

transfer – it can be an immediate value ranging from 1 to 64 or a logical address that specifies

the number of words to be transferred. The Destination (N11:232) is the destination of the

words to be transferred. The Destination should be the matching data-table address in the Data

Input File (DIF) except when you use the instruction to ensure data-block integrity in the case of

Selectable Timed Interrupts (STIs).

Immediate Data

Output

IDO

for ControlNet

processors only

If the input conditions are true, an immediate data output is initiated that updates the private

ControlNet output buffers from the source file before the next normal output-image update. The

Data file offset (175) is the offset into the buffer where the data is stored. The Length (24)

identifies the number of words in the transfer-it can be an immediate value ranging from 1 to 64

or a logical address that specifies the number of words to be transferred. The Source (N12:175)

is the source of the words to be transferred. The Source should be the matching data-table

address in the Data Output File (DOF) except when you use the instruction to ensure data-block

integrity in the case of Selectable Timed Interrupts (STIs).

IMMEDIATE DATA INPUT

Data file offset 232

Length 10

Destination N11:232

IDI

IMMEDIATE DATA OUTPUT

Data file offset 175

Length 24

Source N12:175

IDO

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Rockwell Automation 1785 PLC-5 User Manual Page 48