Appendix C Notes on Applying the I/O Modules
6F8C1575
110
Introduce the notes on applying TC-net I/O module in this section. About the details of TC-net I/O
modules, refer to 6F8C1240
「
High-speed Serial I/O System TC-net I/O Instruction Manual
」
and
6F8C1381
「
Industrial TC-net I/O System Instruction Manual
」
.
About the Serial PI/O modules, refer to 6F8C0779
「
Serial PI/O System Intelligent PI/O Instruction
Manual
」
.
C.1
DC Input Modules
(1) The condition for reading the input signal ON/OFF changes completely is either of
the following:
[Input ON time] = [OFF-to-ON response time] + [Input read cycle]
[Input OFF time] = [ON-to-OFF response time] + [Input read cycle]
The input read cycle is the scanning cycle for batch input/output.
Alternatively, it is the direct input instruction execution cycle if a direct input
instruction is used.
(2) For some external contacts, the reliability of contact may be unable to be
guaranteed with the input current of the module. In this case, install a bleeder
resistor between the input and common so that dummy current can flow.
Figure C-1 DC input connection
(Example of selecting bleeder resistor R)
Input voltage V = 24 VDC
Input module DI934(5.2mA/24 VDC)
Resistance of bleeder resistor
R =
24[V]
50[mA] – 5.2[mA]
= 536[
Ω
]
Wattage of bleeder resistor
P =
(24[V])
2
(536[
Ω
])
×
(2.5
〜
3)
≒3
[W]
Wattage
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