C500LK009V1 Omron, C500LK009V1 Datasheet - Page 85

• Manufacturer Part Number: C500LK009V1
• Description: PC LINK UNIT
• Manufacturer: Omron

Specifications of C500LK009V1

• Leaded Process Compatible: No
• Peak Reflow Compatible (260 C): No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Data Link Characteristics
Case 4
Input
X
Input ON delay
(1)
1, 2, 3...
Note
Input device
Program
PC at node #7
Communications
cycle time
The following diagram illustrates the data flow that will produce the maximum
data link I/O response time when the cycle time of the PC at node #1 t the com-
munications cycle time and the cycle time of the PC at node #7 t the commu-
nications cycle time.
There are three points shown in the diagram above where processing is
delayed, increasing the data link I/O response time.
The equation for maximum data link I/O response time is as follows:
Response time =
input ON delay (1.5 ms) + cycle time of PC at node #1 (15 ms) × 2
+ communications cycle time (19 ms) × 3 + PC cycle time at node #7 (15 ms) × 2*
+ output ON delay (15 ms) = 133.5 ms*
Data link I/O response time
1. The input arrives in the PC just after I/O refreshing, causing a delay of up to
2. At point A data from the previous data exchange is still being transferred, so
3. The data transferred in data link processing arrives at the PC at node #7
1. *If more than 1,642 words are being transferred, 3 cycles of the PC at node
2. Noise may increase I/O delays.
A
one cycle before the input is read into the PC.
the new data cannot be exchanged, causing a delay of up to one commu-
nications cycle time. Furthermore, the data exchange then occurs just after
the PC at node #1 passes the token that makes it the polling unit, causing
another delay of up to one communications cycle time before the data is
transferred in data link processing.
while data exchange is taking place, so the data will not be read into the PC
until the next data exchange, causing a delay of up to one cycle.
Up to 1,642 words can be transferred in a single data exchange, so a delay
of another cycle will occur if more than 1,642 words are being transferred.
#7 are required and the total response time becomes 148.5 ms.
X
1 cycle
(2)
SYSMAC LINK Unit
transmission processing
PC at node #1
1 cycle
Data link transmission
X
Output device
SYSMAC LINK Unit
transmission processing
(3)
Program
Output ON
delay
I/O refresh
Data exchange
Output
Section 5-10
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