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5-3
Section
Sending Commands From a PC
77
RECV(098)
The transmission delay for the RECV(098) instruction can be calculated using
the following equation, which is illustrated in the following diagram.
Max. delay =Local node service cycle + local node service processing time +
transmission processing time (command) + reception processing
time (command) + remote node service cycle + remote node ser-
vice processing time + CPU data read processing time (remote
node) + remote node service processing time + transmission pro-
cessing time (response) + reception processing time (response) +
local node service cycle + local node service processing time +
CPU data set processing time (local node)
Maximum transmission delay
RECV(098) executed in user program
CPU Bus Unit service
processing time (local node)
Transmission processing time (com-
mand)
Reception processing time
(command)
CPU Bus Unit service cycle (remote node)
CPU Bus Unit service processing time (remote node)
CPU Bus Unit service processing time (local node)
Reception processing time (response)
Transmission processing time (response)
CPU data set processing time
Service processing
Service processing
The CPU Bus Unit service cycle is a single PC cycle.
This is the time required to process CPU Bus Units and is approximately 1 ms for
Ethernet Units.
Command:
3 ms
Response:
Number of words transferred x 0.011 + 3 ms
The CPU data read processing time is the integer portion of the minimum cycle
time, which satisfies the following formula.
Number of words transferred x 0.02 + 20 ms < Integer portion of remote node
cycle time
Number of words transferred x 0.02 + 20 ms
CPU Bus Unit Service
Cycle
CPU Bus Unit Service
Processing Time
Transmission and
Reception Processing
Times
CPU Data Read
Processing Time
CPU Data Set Processing
Time