ABB 216AB61 HESG324013R100 HESG216881B Control board
In addition to the input and output modules, there is also a module with both input and output circuits. The number of input and output points is generally the same, making it easier for users to determine the hardware configuration of the PLC.
The rated value of the output current is related to the nature of the load. For example, the relay output module of FX can drive a resistive load of 2A/220VAC, but can only drive an inductive load of 80VA/220VAC and a 100W incandescent lamp. The rated output current is also related to temperature. When the temperature rises, the rated output current decreases. Some PLCs provide relevant curves.
Due to heat dissipation, some output modules need to consider the total current of several output points belonging to the same common point (COM). For example, the rated output current of the transistor output module of FX is 0.8A/COM.
The use voltage of the relay output module is * * *, the conduction voltage drop is small, and the ability to withstand transient overvoltage and overcurrent is strong. However, the action speed is relatively slow, and the service life (action times) is limited. If the switching on and off of the load is not very frequent, it is recommended to choose relay type first.
Transistor type and bidirectional thyristor type modules are used for DC and AC loads, respectively. They have high reliability, fast response speed, and long life, but their overload capacity is slightly poor.
216AB61 HESG324013R100
Using PLC to control the system is very convenient. This is because: first, the establishment of PLC control logic is a program, replacing hardware wiring with a program. Programming is much more convenient than wiring, and changing the program is certainly much more convenient than changing the wiring!
Secondly, the hardware of PLC is highly integrated and has been integrated into various miniaturized modules. Moreover, these modules are complementary and have been serialized and standardized. The modules required for various control systems are mostly supplied by PLC manufacturers and can be purchased on the market. Therefore, the hardware system configuration and construction are also very convenient.
Because of this, the word “can” exists only with programmable controllers. For software, its programs are programmable and not difficult to compile. For hardware, its configuration is variable, and it is also easy to change.
Specifically, PLC has five advantages:
(1) Convenient configuration: To meet the needs of the control system, determine which PLC to use, which type, what modules to use, and how many modules to use. After determining, order and purchase from the market.
(2) Convenient installation: PLC hardware installation is simple, and assembly is easy. External wiring is provided with a connector, which is simple to connect. When replacing a module after one connection, it is sufficient to install the connector onto the new module, without any further wiring. Do not connect any internal wires, just make some necessary DIP switch settings or software settings, and prepare a user program to work.
(3) Convenient programming: Although there are no actual relays, time relays, and counters inside the PLC, these devices actually exist through programs (software) and system memory. The number is unimaginable for relay control systems. Even for small PLCs, the number of internal relays can be counted in thousands, while the number of time relays and counts can also be counted in hundreds. Moreover, the contacts of these relays can be used * * times. There are so many internal logic devices in PLC that users no longer feel any restrictions when using them. All that is considered is entry and exit points. It doesn’t matter how much this internal entry and exit point is used. The control points of a large PLC can reach more than 10000 points. How can there be such a large practical system? If it is not enough, it can also be controlled online without any restrictions. The command system of PLC is also very rich, which can easily achieve various switching values and analog control. The PLC also has a memory area for storing data, which can store all the information to be saved during the control process In short, due to the powerful functions of PLC, the restriction on its role in the control system is no longer the PLC itself, but people’s imagination, or other hardware facilities supporting it.
216AB61 HESG324013R100
| ABB | 3BHB003154R0101 |
| ABB | 3BHB003688R0001 |
| ABB | 3BHB003688R0101 |
| ABB | 3BHB003689 |
| ABB | 3BHB004027R0101 |
| ABB | 3BHB005171R0101 |
| ABB | 3BHB005243R0105 |
| ABB | 3BHE009681R0101 |
| ABB | 3BHE021951R0124 |
| ABB | 3BHE024747R0101 |
| ABB | 3BHE027632R0101 |
| ABB | 3BHE039203R0101 |
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