IB IL 24 MUX MA-PAC
50
PHOENIX CONTACT
5981_en_06
7.4
Providing surge protection
Surge protection measures are described in Section “Surge protection” on page 35.
•
Select a protection of the remote bus.
Version 1a is selected for the example.
•
Also provide protection for the power supply and the entire control cabinet.
7.5
Selecting the transmission medium
Possible transmission media are described in Section “Transmission media” on page 41.
•
Select a transmission medium that meets your demands.
Transmission over a copper remote bus cable is selected for the example.
7.6
Determining the transmission time
The formulas to calculate the transmission time are given in Section “Transmission time” on
The example station (see Figure 7-2) is equipped with a copper cable. Therefore, the
formula for copper cables is used for the calculation.
Calculation of n:
This results in the following transmission time:
t
up
= n * 6.8 ms/byte + 78 ms
t
up
=
Update time for field multiplexer I/O data
n
=
Number of bytes to be transmitted
Terminals used:
DI 4
DI 2
DO 2
AI 2
Number of bytes to be transmitted per terminal:
1
1
1
4
Total number of bytes to be transmitted:
n = 1 + 1 + 1 + 1 + 4 = 7
t
up
=
n
* 6.8 ms/byte + 78 ms =
7
bytes * 6/8 ms/byte + 78 ms
t
up
= 125.6 ms
Содержание 2861205
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