Moxa ICF-1280I-M-ST-T [9/16] Slot time settings
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Moxa ICF-1280I-M-ST-T [9/16] Slot time settings

Moxa ICF-1280I-M-ST [9/16] Slot time settings
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5. Conditions of safe usage:
•
This equipment must be installed in an enclosure that can only
be accessed with a key or other tool, and which provides a
degree of protection not less than IP54 in accordance with IEC
60079-15.
• These devices are designed for use in an area of
not more than
pollution degree 2 in accordance with IEC 60664-1.
• Transient protection must be provided and set at a level not
exceeding 140% of the peak rated voltage value at the supply
terminals to the equipment.
Slot Time Settings
Although ICF-1280I series converters can be connected in different
topologies with a large number of units, the total cable length and
network topology can give rise to frame delays. A sufficient slot time is
required to prevent the PROFIBUS master from timing out. Engineers are
recommended to set the PROFIBUS master’s slot time according to the
following formulas.
For linear and star topologies:
Slot time = A + B × L + 13 × N
Transmission Speed (kbps)
A
B
12000
811
120
6000
461
60
3000
261
30
1500
161
15
500
111
5
187.5
71
1.875
93.75
71
0.9375
45.45
411
0.4545
19.2
71
0.192
9.6
71
0.096
For redundant ring topology:
Slot time = A + B × L + C × N
Transmission Speed (kbps)
A
B
C
12000
1651
240
28
6000
951
120
24
3000
551
60
24
1500
351
30
24
500
251
10
24
187.5
171
3.75
24
93.75
171
1.875
24
45.45
851
0.909
24
19.2
171
0.384
24
9.6
171
0.192
24
L: The length of the fiber optic cable, in kilometers.
N: The number of converters in the system.
A, B, C: Parameters set according to different baudrates.
Note: To avoid frame conflicts, we recommend setting the PROFIBUS
command retry limit ≥ 3, and the slot time < 262128.

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