Omron CJ1W-ETN11 Operation Manual page 116

Sending Commands From a PC
RECV(098)
RECV(098) executed in user program
Reception processing time
(command)
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
CPU Bus Unit service cycle (local node)
CPU Bus Unit service processing time (local
node)
Transmission processing time
Reception processing time
CPU Bus Unit service cycle (remote node)
CPU Bus Unit service processing time (remote
node)
CPU data set processing time (remote node)
Total
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 pro-
cessing time (command) + remote node service cycle + remote
node service processing time + CPU data read processing
time (remote node) + remote node service processing time +
transmission processing time (response) + reception process-
ing time (response) + local node service cycle + local node ser-
vice processing time + CPU data set processing time (local
node)
CPU Bus Unit service
processing time (local node)
Transmission processing time (com-
mand)
CPU Bus Unit service processing time (remote node)
Maximum transmission delay
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:
Response:
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
Item
CPU data set processing time
Service processing
CPU Bus Unit service processing time (local node)
Reception processing time (response)
Transmission processing time (response)
Service processing
CPU Bus Unit service cycle (remote node)
3 ms
Number of words transferred x 0.011 + 3 ms
Section 5-3
Calculation
PC cycle time = 10 ms
1 ms
256 x 0.011 + 3 = 5.816 ≅ 6 ms
256 x 0.011 + 3 = 5.816 ≅ 6 ms
5 ms
1 ms
256 x 0.02 + 20 = 25.12 ≅ 25 ms
10 + 1 +6 + 6 + 5 + 1 + 25= 54 ms
95