One-To-One Pc Link I/O Response Time - Omron CPM1 Programming Manual

Maximum I/O Response Time The CPM2A/CPM2C takes longest to respond when it receives the input signal
Input
point
Input ON delay (10 ms)
Input
bit
Program execution
I/O refreshing
and other processes
Output
point

8-2-3 One-to-one PC Link I/O Response Time

Master
Input
Minimum I/O Response Time The CPM2A/CPM2C responds most quickly under the following circumstances:
1, 2, 3...
just after the input refresh phase of the cycle, as shown in the illustration below.
In that case, a delay of approximately one cycle will occur.
I/O refreshing
(15 ms)
Max. I/O response time = 10+15 × 2+15 = 55 ms
When two CPM2A/CPM2Cs are linked 1:1, the I/O response time is the time re-
quired for an input executed at one of the CPM2A/CPM2Cs to be output to the
other CPM2A/CPM2C by means of 1:1 PC Link communications.
The minimum and maximum I/O response times are shown here, using as an
example the following instructions executed at the master and the slave. In this
example, communications proceed from the master to the slave.
Output (LR)
The following conditions are taken as examples for calculating the I/O response
times. In CPM2A/CPM2C PCs, LR area words LR 00 to LR 15 are used in 1:1
data links and the transmission time is fixed at 21 ms.
Input ON delay:
Master cycle time:
Slave cycle time:
Output ON delay:
1. The CPM2A/CPM2C receives an input signal just prior to the input refresh
phase of the cycle.
2. The Master's communications servicing occurs just as the Master-to-Slave
transmission begins.
Program execution
and other processes
(15 ms)
Output ON delay (10 ms)
Slave
Input
(LR)
10 ms (input time constant: default setting)
10 ms
15 ms
15 ms
Section 8-2
I/O refreshing
Output