Omron E5AF, Operation Manual

Page: 42 / 82

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3--20 Communications Time
Due to transmission speeds and E5AF’s internal processing, there will be a
time delay in RS-232C, RS-422, or RS-485 communications as follows:
Example 1: Writing the Main Setting
Setting 500
A
C to Channel no. 01, Controller no. 00.
Command Format:
@00WS010500 (FCS 2 digits)
B
15 bytes.
Since the configuration of start-stop sync data requires 11 bits to 1 byte,
11 bits x 15 bytes = 165 bits. Therefore, when communicating at 1,200 bps,
165/1,200 bps = approx. 0.2 s.
Internal Processing Time: 0.5 s max.
Operating Cycle: 0.5 s max.
The time from the start of communications to the start of the resulting opera-
tion is therefore a maximum of 1.2 s (0.2 + 0.5 + 0.5).
Example 2: Reading the Process Temperature
Reading the temperature of Controller 00.
Command Format:
@00RX01(FCS 2 digits)
B
11 bytes.
11 bits x 11 bytes = 121 bits.
Response Format:
@00RX000500(status data 4 digits)(FCS 2 digits)
B
19 bytes (present
value: 500
A
C).
11 bits x 19 bytes = 209 bits. Therefore, when communicating at 1,200 bps,
(121 + 209 bits)/1,200 bps = approx. 0.3 s. However, no more than 0.8 s is
required between the time the command is sent and the response is output.
Internal Processing Time: 0.5 s max.
Operating Cycle: 0.5 s max.
The time from the communications start to the process temperature read is
approx. 0.5 s. Thus the temperature displayed is actually no more than a
maximum of 0.7 s (0.2 + 0.5) previous to the time of reading.
Section 3--20