Using a field multiplexer in the field multiplexer system
5981_en_06
PHOENIX CONTACT
13
2.3
Transmission time
The maximum time required for data transmission depends on the type of transmission
medium that has been selected, and can be calculated using the formula below.
When operating field multiplexer systems over copper cables, the following formula applies
If the field multiplexer is operated over fiber optics, this formula applies
The number of bytes to be transmitted depends on the particular terminal:
The transmission time typically varies within the following limits:
Only the I/O terminals from one of the two stations have to be taken into consideration
when making the calculation.
t
up
= n * 6.8 ms/byte + 78 ms + m
t
up
=
Update time for field multiplexer I/O data
n
=
Number of bytes to be transmitted
m
=
Delay when using different transmission media
Copper
m = 0 ms
Telephone line
m = 20 ms
Ethernet cable
m = 0 ms
Bluetooth connection
m = 40 ms
t
up
= n * 1.37 ms/byte + 10 ms
Both formulas are valid for worst case scenarios. Transmission is usually faster.
Type of terminal
n [in bytes]
Digital terminal with 2, 4, or 8 channels
1
Digital terminal with 16 channels
2
Digital terminal with 32 channels
4
Analog terminal with 1 channel
2
Analog terminal with 2 channels
4
t
up
(copper):
80 ms ... 500 ms
t
up
(fiber optic):
10 ms ... 100 ms
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