product description：
2.7 Digital input/output module
1. Principle of digital input/output module
(1) Principle of digital input module
The digital input module is used to connect external mechanical contacts and digital electrical signal processors, which convert electrical signals from field devices (such as transfer switches, limit switches, proximity switches, temperature sensors, electromagnetic coils, valve actuators, etc.) into a level signal that can be processed by the CPU. All I/0 modules are connected to the bus in photoelectric isolation and can be configured by software
PLC input circuit according to the type of external power supply is divided into DC input circuit and AC input circuit; According to the PLC input module common end (COM end) current flow is divided into source input circuit and leakage input circuit: according to the connection of the common end of the light emitting diode is divided into common anode and common cathode input circuit; According to the wiring mode, it is divided into manifold type, grouping type and separation type.
The I/0 circuit of the sink point has a common point, and the input point or output point shares a power supply: the I/0 circuit of the packet type is divided into thousands of groups, and the I/0 circuit of each group has a common point, and the circuit between the groups is separate, and different power supplies can be used respectively; The separated I/0 circuits are isolated from each other, and each I/0 can use an independent power supply, as shown in Figure 2-14.
Therefore, the digital input module is divided into two basic signal types: DC signal input and AC signal input
Major advantage
Voltage and frequency protection with automatic on-load regulation
Automatic and manual voltage regulation can be used for bus undervoltage and overvoltage monitoring, load reduction and recovery
With pre-configured standard configurations, you can also quickly and easily meet different application requirements through functional configuration
Pluggable design for quick installation and testing
Large LCD display with editable single line charts, accessible locally or via an easy-to-use HMI based Web browser
Thoughtful product life cycle service
Main characteristics
Comprehensive protection control functions for bus voltage monitoring, load shedding and recovery, including high frequency protection and low frequency protection functions
With automatic on-load voltage regulation function
Optional arc protection and high speed outlet (not compatible with automatic voltage regulation)
IEC61850 1st and 2nd editions are supported, including redundant HSR and RPR, GOOSE and IEC61850-9-2 LE
Support IEEE 1588 v2 high precision time protocol
Supports MODBUS, DNP3, and IEC 60870-5-103
Why Buy From Changxin?
★ 1 Year Warranty on most products
★ Fast and convenient shipping
★ Large inventory of over 20,000 items
★ Great low prices on all conditions
★ Extensive quality control and testing
Company Profile
Changxin can find and sell discontinued products. If you ask,we can help you
to buy used items too. Changxin is able to offer automation solutions and
technical supports by experienced experts.We engaged in PLC, DCS, vibration
monitoring system, steam turbine control system, gas generators etc.We promise
factory original,high quality & low price & large inventory.
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