One-To-One Pc Link I/O Response Time - Omron CPM1 - PROGRAMING MANUAL 02-2001 Programming Manual

CPM1/CPM1A Cycle Time and I/O Response Time
Maximum I/O Response Time The CPM1/CPM1A takes longest to respond when it receives the input signal
Input
point
Input ON delay (8 ms)
Input
bit
Program execution
I/O refreshing
and other processes
Output
point

8-1-4 One-to-one PC Link I/O Response Time

Master
Input
Minimum I/O Response Time The CPM1/CPM1A 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 = 8+15
When two CPM1/CPM1As are linked 1:1, the I/O response time is the time re-
quired for an input executed at one of the CPM1/CPM1As to be output to the
other CPM1/CPM1A 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 CPM1/CPM1A PCs, LR area words LR 00 to LR 15 are used in 1:1 data
links and the transmission time is fixed at 12 ms.
Input ON delay:
Master cycle time:
Slave cycle time:
Output ON delay:
Peripheral port:
1. The CPM1/CPM1A 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)
2+10 = 48 ms
Slave
Input
(LR)
8 ms (input time constant: default setting)
10 ms
15 ms
10 ms
Not used.
Section 8-1
I/O refreshing
Output
515