TXP-C20_Instruction_Manual_(Rev1.0)
REV – 1.0
[34-2900-0207-5 ]
21
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P a g e
4
Motherboard Interface PCB
The TXP-C20 Motherboard shown below in Figure 4-2 is the interface between the Display / CPU assembly and all
other system I/O devices. The Display / CPU assembly attaches to the motherboard with 4-standoffs and connects
via ribbon cable to S1. Several input options, described in the following sections, are available that may be installed
into the Sensor Input Option P1 connector located on the lower left side of the motherboard. The middle position
P2 connector is for the 4-20mA Output option and the right position P3 connector is for the Discrete Relay option.
Other option devices such as Modbus RTU RS-485, Ethernet and a data logger may also be installed to connectors
located on the Motherboard.
The Motherboard PCB contains a 24 VDC universal input (100-240 VAC) switching power supply with up to 350mA
available at TB3 Auxiliary Power Output terminals. If AC power is unavailable, or if a DC battery back-up supply is
needed, TB1 provides terminals for DC power input. Blocking diodes isolate internal and external DC supplies as
shown in Figure 4-1. See section 1.2.1 for additional power source information.
Figure 4-1 – Motherboard Power Connection
TB2 offers field terminals for a remote alarm reset switch. The motherboard also includes alarm relays 1 & 2 (K1 &
K2) and their indicating LED’s. TB4 provides field wiring terminals for these relays. TB5 is for connection to the 100-
240 VAC power source. J2 is a 2-pin connector for powering the optional audible annunciator.
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Содержание TracXP TXP-C20
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Страница 12: ...TXP C20_Instruction_Manual_ Rev1 0 REV 1 0 34 2900 0207 5 10 P a g e Figure 3 1 Menu Tree ...
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