Rockwell Automation 1785-Lx0C15 ControlNet PLC-5 Programmable Controllers User Manual - Manual (Page 118)

1785-UM022C-EN-P - February 2008
C-2 ControlNet Instruction Set
Immediate Data I/O Instructions
Immediate I/O Execution Times
Instruction Description
Immediate Data
Input
IDI
If the input conditions are true, an immediate data input is initiated that
updates the destination file from the private 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 DIF except when you use the instruction
to ensure data-block integrity in the case of Selectable Times Interrupts
(STIs). See page 4-8 in the Using ControlNet IMmediate Data Input and
Output Instructions section.
Immediate Data
Output
IDO
If the input conditions are true, an immediate data output is initiated that
updates the private memory 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 DOF except when you use
the instruction to ensure data-block integrity in the case of Selectable
Timed Interrupts (STIs). See page 4-8 in the Using ControlNet Immediate
Data Input and Output Instructions section.
Instruction: Processor:
Execution Time (
μ
s)
Words of Memory
True: False:
INN - Immediate Input PLC-5/20 C15
PLC-5/40C15, -5/46C15 and -5/80C15
389
347 1.1 2
IOT - Immediate Output PLC-5/20 C15
PLC-5/40C15, -5/46C15 and -5/80C15
323+(14.5 x dis)+(6.7 x DOF)
330+(27.5 x dis)+(13.25 x DOF)
1.1 2
IDI - Immediate Data
Input
PLC-5/20 C15
PLC-5/40C15, -5/46C15 and -5/80C15
538+(0.65 x words)
488+(0.65 x words) 1.1 4-7
IDO - Immediate Data
Output
PLC-5/20 C15
PLC-5/40C15, -5/46C15 and -5/80C15
286+(1.23 x words)+(14.5 x
DOF)+(6.7 x dis)
270+(1.6 x words)+(27.5 x
DOF)+(13.25 x dis)
1.1 4-7
words - IDI or IDO transfer length
dis - Total number of ControlNet connections using the discrete Output image file
DOF - Total number of ControlNet connections using the Data Output File
IDI
IMMEDIATE DATA INPUT
Data file offset
Length
232
10
Destination N11:232
IDO
IMMEDIATE DATA OUTPUT
Data file offset
Length
175
24
Source N12:175