Delay Times - Omron CS1W-SLK11-21 - 06-2004 Manual

PLC Network Instructions
Note
6-2-9

Delay Times

SEND(90)
Note
SEND(90)
executed
SYSMAC LINK Unit servicing
(destination node)
To execute more than one instruction in sequence at the same port, you must
use the Port Enabled Flags to be sure that only one instruction is being exe-
cuted at the same time for any one port.
The two diagrams that follow indicate the sequence of processing that will
enable users to calculate the maximum delay time to be expected between
the time SEND(90) or RECV(98) is executed and the time the data is stored in
the remote or local node's memory area, ready for use by other instructions in
the program.
The following diagram indicates the data flow that will yield the maximum
delay time from the time SEND(90) is executed by the user program to the
time the SYSMAC LINK Unit stores the data in the destination Unit's memory.
Be sure to take into account the time required for data links and program exe-
cution, which are not included in the following example.
LINK Service processing (source node)
Transmission processing
Transmission delay
Max. transmission delay
Max. transmission delay = Link servicing interval (source node) + Link service
processing (source node) + Transmission processing + Communications
cycle time + Transmission delay + Reception processing + LINK Unit servicing
interval (destination node) + Link service processing (destination node)
Link Servicing Interval (Source and Destination Nodes)
Links are serviced once per PLC execution cycle. Refer to the CS-series PLC
Operation Manual for details.
Link Service Processing (Source and Destination Nodes)
Link service processing is the same as the PLC's peripheral servicing and is
approximately 1 ms for SYSMAC LINK Units.
Transmission and Reception Processing
Number of words transferred x 0.0045 ms + 4 ms
Communications Cycle Time
Coaxial: Max. node address × 0.01 ms + No. of nodes × 0.075 ms + No. of
polled units × 0.75 ms + 1.322 ms
Optical: Max. node address × 0.01 ms + No. of nodes × 0.133 ms + No. of
polled units × 0.75 ms + 1.322 ms
SYSMAC LINK Unit servicing (source node)
Communications cycle
Reception processing
LINK Service
processing
(source node)
Data stored
Section 6-2
LINK Service processing
(destination node)
105