10.4.3 Handler wiring operation instructions for transformer Scan
This section focuses on the example of wiring between the sorting interface of TH2840 transformer
scanning and a typical PLC. The wiring example only introduces the wiring of two PLCs, that is, the
PLC input circuit common anode and the PLC input circuit common anode. For PLCs with other
types of input circuits, you can consult our after-sales service.
The PLC input circuit common anode means that the current flows in from the common terminal of
the module and flows out from the input channel of the module, which is often referred to as the
source wiring method.
The PLC input circuit common cathode means that the current flows in from the input channel of
the module and flows out from the common terminal of the module, which is often referred to as the
drain wiring method.
When using transformer scanning and sorting, PLC wiring diagram where handler interface and
input circuit are common anode is shown in Figure 10-16, and PLC wiring diagram where handler
interface and input circuit are common cathode is shown in Figure 10-17.
The factory default of TH2840 series instrument is external power supply. That is, pins 2 and 3 of
J307 are short-circuited, pins 2 and 3 of J310 are short-circuited, JP501 is open, and JP503 is open.
Therefore, be sure to connect the power supply to the external power supply pin when using it. If
you need to use the internal power supply of the instrument, you need to change the jumper mode of
J307 and J310. Please consult our after-sales service for details.
Note: 11, 12, 13 of Trans Handler and 22, 23 of Trans Controller are the 5V power supply
inside the instrument and cannot be connected to any external power supply, otherwise the
instrument will be damaged.
Considering the anti-interference ability of the instrument, TH2840 recommends users to
provide and use an external power supply as the pull-up power supply of ULN2003.
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