Mitsubishi PLC A1SJ61BT11 MELSEC-A Series High-Performance Module

l Part No: AA1SJ61BT11

l Product name: Mitsubishi PLC A1SJ61BT11 MELSEC-A Series High-Performance Module

l Brand: Mitsubishi

l Place of Origin: Japan

l Warranty: 1 Year

l Condition: Original New with sealed box

l Transmission speed  ：156kbps / 625kbps / 2.5Mbps / 5Mbps / 10Mbps (selectable)

l Maximum total cable extension (maximum transmission distance)

l Ver.1.10

l At 156kbps ： 1200m

l At 625kbps  ：900m

l At 2.5Mbps  ：400m

l At 5Mbps  ：160m

l At 10Mbps  ：100m 

l Station type  ：

l Master station (Ver.1 master station)

l Local station (Ver.1 local station)

l Maximum number of connections

l At the time of master station  ：64 units

l Number of occupied stations Local station time  ：1 to 4 stations

l Communication method  ：Broadcast polling method

l Synchronous method  ：Frame synchronization method

l Coding scheme  ：NRZI code (Non Return to Zero Inverted)

l Transmission line format  ：Bus (RS-485)

l Transmission format  ：HDLC compliant

l Error control method  ：CRC (X 16 + X 12 + X 5 + 1)

l communication cable  ：

l Ver.1.10 compatible CC-Link dedicated cable

l CC-Link dedicated cable (Ver.1.00 compatible)

l CC-Link dedicated high-performance cable (Ver.1.00 compatible)

l Number of I / O occupied points  ：32 points (I / O allocation: special 32 points)

l DC5V internal current consumption  ：0.40A

l External dimensions

l Height (H)  ：130mm

l Width (W)  ：34.5mm

l Depth (D)  ：117.5mm

l Mass  ：0.25kg

What is a PLC?

Before we get too far into technical specifics, let’s review how a PLC system operates.

It’s a specialized, hardened, computer device designed for use within industrial control systems. It controls devices and equipment by connecting different units and enabling them to work in a coordinated manner.

What gives it this power?

At the core of every PLC is a basic computer processor that gathers various inputs and evaluates them to achieve the desired output. The inputs can be digital or analog. As users can program the system in multiple ways to fit a certain scenario, PLCs within many applications across various industries, including conveyor systems, oil refineries, manufacturing lines and more.

While these might be more sophisticated scenarios, consider the interaction between a simple light switch and a light bulb. By flipping the switch, a user can only turn the light on or off. There is little versatility or flexibility in this application.

Now, say a PLC joins the mix. Suddenly, the user can create more complex controls. For instance, he can make the light blink on or off or make the light turn off one minute after it turns on. Now think of thousands or even tens of thousands of circuits all being controlled in coordination with each other. While that is a simple explanation, that is essentially what a PLC does.

How Does It Work?

We’ve covered that a PLC relies on a computer processor to turn myriad inputs into logic to control a myriad of outputs. Yet, how does this occur?

As the PLC scans inputs from multiple sources, it scans them and internalizes them. Then, it executes the user programming to enact the desired outputs. Next, it communicates any necessary information to a control network such as Modbus or Ethernet IP. Because PLC’s are in charge of mission critical systems and there are usually people near machines, a series of diagnostics are run to make sure everything is in order, before it scans the inputs again. This entire process is the “scan cycle.” The larger the number of inputs, the larger the PLC program, the longer the scan cycle. The scan cycle is measured in milliseconds, more commonly known as “fast.” However, there are some applications where fast isn’t fast enough. A Programmable Automation Controller, or PAC, may be needed. A PAC uses multiple CPUs in a single system or chassis to provide parallel processing, or specialized processing of different facets of the application.

Therein lies the importance of user programming, as the program is what causes the PLC to produce the desired results. Without it, the PLC is just an expensive doorstop.

In this way, a PLC is often described as a small, specialized computer. It shares similar terminology with traditional computing systems, including memory, software, CPU, I/O system and more. Yet, a PLC is made to function in an industrial environment, controlling concrete inputs and outputs from devices, machines and workers, while a personal computer is built to exist in your home or office.

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