Programmable Timer Relay, 12-Input 12-Output, 24V DC

This 12-in 12-out simple programmable PLC controller (programmable timer relay) is an an all-in-one device with 12 relays output, and optional 485 Modbus output and 2-channel analog input/output. Simple operation, powerful function and widely used in automation industry.

Function

• Can replace ordinary PLC
  The custom button simulates the start, pause and emergency stop function. Multiple switch inputs can be connected to various sensors, realize the logic operation of PLC action flow, custom programming of output functions, and independent or combined timing functions for multiple time periods.
• Can work as multiple timer relays
  The programmable timer relay can achieve any combination of year, month, date, day of the week, time, etc., to trigger a series of specific actions.
• Can replace PLC analog current module voltage module
  With analog unit calculation, the simple PLC can realize programming intuitively.
• Program encryption
  The set program can be encrypted to avoid being changed by others.
• Offline management
  No need to connect the computer and mobile phone, can edit and set directly on the control panel with high-definition LCD display, easy to operation.

Specification

* The output termianls require additional power supply. especially when the supply voltage of the simple PLC is different from supply voltage of loads.

Input & Output Spec

• Input
  The simple PLC can be connected to various switch-isolated inputs such as push buttons, proximity switches,cylinder magnetic switches, relay contacts, photoelectric sensors, Hall sensors, etc. It has built-in 5V pull-up and over-current and over voltage protections.
  For the simple PLC with analog input, it  can also support the transmitter, current and voltage module and other signal access, with analog input range (0~20mA, 4~20mA, 0~5V, 0~10V).
• Output
  It can be connected to various switching loads, like contactors, solenoid valves, relays, LEDs, alarm devices, etc. The model with analog output can also be controlled by 0-10V to the frequency converter to adjust speed etc.

Wiring Diagram

Tips: Differences between PLC and Relay Control

In the programming language of PLC, ladder diagram is the most widely used language. Through the PLC instruction, the ladder diagram is converted into the program that PLC can accept, then entering into the PLC user storage area by the programmer. The trapezoidal diagram and relay control schematic diagram is very similar, and the main reason is that the invention of PLC trapezoidal diagram is generally along the relay control circuit element symbol, only some individual differences.

The main differences between PLC and relay control are as follows.

1. Different components
Relay control circuits are composed of many true hardware relays. A PLC is made up of many "soft relays" that are actually triggers in memory that can be set to "0" or "1".

2. The number of contacts is different
The contact points of hard relay are limited, generally only 4 to 8 pairs. A "soft relay", on the other hand, can be programmed with an infinite number of touch points because the trigger state can be used any number of times.

3. Different control methods
Relay control is implemented through hard wiring between components, so its control functions are fixed in the line, not flexible. And PLC control is through software programming to solve. As long as the program changes, the function can be changed and the control is very flexible. And because PLC works through the cycle of scanning, there is no relay control circuit interlocking and interlock circuit, and control design greatly simplified.

4. Different ways of working
In the control circuit of relay, when the power is switched on, each relay in the circuit is in a restricted state, which is either closed or broken. In the ladder diagram of PLC, each "soft relay" is in the process of periodic cycle scanning connection. Objectively, each "soft relay" is restricted by conditions and the connection time is short. That is to say, the operating mode of the relay in the control is parallel, while the operating mode of the PLC is serial.