Processing Time; Figure 11-7 Processing Time Concept; Table 11-2 Overview Of The Transmission Time Required For One Cycle (One Scan) - Hitachi S10VE User Manual

11. Operation

11.3.3 Processing time

Figure 11-7 shows a representation of the processing time until an external output signal is output from the
output module, after an external input signal is input into the input module. If the external input signal, the
remote I/O line transfer operation, and the ladder processing are performed asynchronously, the sum total of
(1) through (4) is not always accurate, but this value can serve as a rough estimate. If remote I/O is operating
according to the ladder synchronous mode, (3) is always the time for one sequence cycle.
External input
signal
(1) Input delay time
This is the response time of the input module. The response time differs depending on the type of input
module, but for transistor-based modules the time is about 0.5 ms, while relay-based modules have times
ranging from about 10 to 25 ms. For details, see S10mini Hardware Manual I/O Modules (manual
number SME-1-114) or HSC-2100 Hardware Manual I/O Modules (manual number SME-1-126).
(2) Remote I/O transfer time
This is the time required to transfer data on the remote I/O line. Transfer time varies depending on the
I/O point settings and whether a timeout has occurred on the line. Table 11-2 gives an overview of the
transmission time required for one cycle (one scan) based on the I/O points, but if a timeout has occurred
on the line, check and correct the remote I/O point settings.

Table 11-2 Overview of the transmission time required for one cycle (one scan)

No. Remote I/O points
1 64
2 128
3 256
4 512
5 1024
6 1536
7 2048
8 Timeout on the line
(about 16 points)
Note: When using ladder synchronization mode, the communication time is the same as that shown above, but the
time for one sequence (one scan) depends on the ladder running time.
Remote I/O
line
Input
module
(1) (2)
Input delay
Transfer time
time
(0.8 to 22 ms)
(0.5 to 25 ms)

Figure 11-7 Processing time concept

Overview of the transmission
time required for one cycle
(one scan)
0.8 ms
1.5 ms
2.8 ms
5.5 ms
11 ms
16.5 ms
22 ms
+0.085 ms
(+85 µs)
Remote I/O
line
CPU
module
(3) (2)
Ladder Transfer time
processing (0.8 to 22 ms)
time
(1 to 999 ms)
No timeout has occurred on the line
This is the rough amount of time added to the
communication time when a timeout occurs once on
the line in about 16 points.
11-6
Output
External output
module
signal
(4)
Output delay
time
(0.2 to 15 ms)
Notes