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Hello in this video.
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We are going to learn serial communication plc programming example for vfd parameter settings.
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Okay.
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We are adapting our plc or  master plc to communicate with the slaves but also if you are communicating
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with the AC drive or vfd you need to communicate, adapt parameters of this vfd or AC
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drive.
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First of all modbus communication address of the device is specified must be plc is master.
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So address of plc is one vfd address cannot be one so you can give to your VFD address as to
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three or another the parameters that will be communicated with  RS485  must be set.
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So your source of first master frequency command and also source of first operation command must be
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adopted RS485 so for the vfd-e
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You can see it in here.
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Parameter 2.00  must be 3 and also parameter 02.01 should be 3 or 4.
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And also if the frequency read and write operation is to be done from plc the related parameters should
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be adjusted  stop operations will be done from plc  the relevant parameter input must
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be made.
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These are so we can give operation command to go run forward or stop or backward parameter 2.01
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is relevant parameter and for the frequency read and write operations source of first frequency
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command.
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So we will give frequency value  from our plc to our vfd so we need
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adopt parameter 2.00 4 VFD-E drive parameter setting should be done for 9600 baudrate.
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This is an example for example if you are using baudrate as 19200  So what
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you need.
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You need to adopt your these parameters these parameters are starting from 09.00
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And it goes on.
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So in here you're gonna see a communication address of your device for vfd-e.
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you need to give a address for example two or three or five.
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You need to change your parameter 9.00 parameter.
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This is important and also transmission speed is means our baudrate.
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You need to change your 09.01 parameter, parameter must be entered for example seven.
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E 1,  7 even 1.
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It's our protocol.
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Imagine like this.
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You need to put it in here.
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09.04
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So timeout detection and also transmission fault treatment.
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These are whole parameters that you're gonna use for the vfd side and also the last thing it should
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be noted RS485 communication between PLC and inverter is cross in here.
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You can see VFD-E side or vfd side or AC drive side connection cabling.
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So it will be RJ45 jack.
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if you look behind it or front it.
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So from the right side to the left side it is starting from 1 to 8,  8 pin so 14 should be SG-
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15 should be.
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SG+ and 13 should be ground so for the ground doesn't matter it is important but the for RS485
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communication you need 2 cable because RS 485 communication is 2 wiring cabling it is need just 2 cable
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+ and - in here the first part.
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of our program in the first scan we are writing k1 So this is our Master Plc address in D1121
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in here we are writing our protocol the timeout and we are resetting
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complete steps no from starting S1 to S45 and we are setting S0 and then in S0
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step we are activating M0 bit so we are using a timer timer it's going to the count or after two.
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multiply by 100 milliseconds so after two hundred milliseconds this timer will be on in m0 after
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M0 activated so suddenly S0 step is activated M zero will be activated so m0 in the
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rising edge contact we are setting M1122
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So this is our sending request auxiliary relay or internally special bit.
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So in the previous  lesson we already showed it to in the table remember that.
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So we are setting this one modrw command or modrw instruction what we are
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doing in here ,in here D50 is written to hexadecimal 2001
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Let's take a look what is it.
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It is frequency
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command
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So what you entered inside of D50 this will be your frequency and then we are waiting.
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M1123
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And if I'm sending or receiving is completed.
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So we are resetting this flag and inside of this time already we write this data because the communication
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is very high very  high speed communication also according to our baudrate and we are writing
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and reading a lot of data inside of the seconds.
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So we are setting after these timer is on in the rising edge contact we are setting S1, S1 is
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activated so M1 is activated this auxiliary relay bit is activated.
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So in the rising edge of this bit  in we are using M100 auxiliary relay also.
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So if M100 goes high or activated by you we are sending request read and write request
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again.
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So now what we are using -> H2000.
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Let's take a look.
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H2000 so we are gonna give a command to our vfd run forward or backward or similar or
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something like this.
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So let's go back here what we are writing in here we are writing to third slave K3 is the slave number
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slave number is three.
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So third slave.
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We are writing hexadecimal twelve so in here let's go back to in here how can we calculate it in here.
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Let's take a look.
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Our calculator and go back to programmer
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--
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I will use binary
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in here.
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OK.
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So hexadecimal12 (h12 / 16#0012)
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hexadecimal eight.
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I will activate this.
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Not this one.
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I'm going to
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find  it.
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So this is seven.
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This is f this is D.
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This is C. ten and twelve so forth bit is one so Fifth bit is zero so 0 and 1.
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This is forward command.
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So  first bit is zero.
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Okay bit zero is zero but bit 1 is 1 so 01 is what is the meaning of it.
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Or 1and 0 
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We can we should look from left to right.
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It is run ,run and forward command is used in our example.
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So we are writing in this step to our vfd run and forward turn forward and run command is write
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it in here and also after M101 auxiliary relay bit or this contact is activated by
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you in the after is activated or goes from off to on.
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We are sending request again and then we are writing to 3.slave hex 1.
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what was the hex 1 so hex 1 in here let's take a look.
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1 should be stopped.
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So if you want to stop your machine  or stop your vfd in step 1 after M101  is activated
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by you you are stopping your VFD.
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So what we get.
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Till now we write our frequency command here.
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Okay.
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This.
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is written into the vfd.
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So this is forward button and run button.
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This is stop button from your HMI or  it's coming inside of HMI or you can put these contacts
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as output with your physical inputs and etc or you can use it inside of your plc in any
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any part of your project.
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And after these are finished are these writing and reading is completed.
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But we are writing in here.
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Writing is completed.
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This flag is activated and then suddenly it is resetted and we jump to set S2,  S2 step in here.
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Let's go to S2 in here.
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We have two part for S2 and in here a request to read and write to specified.
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That's okay.
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The current frequency information was read from the drives from where , from h2102
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address 2102 is here it is frequency command
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let's go back here from the 3.slave we read these data how many will be read.
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Six data is read automatically and saved in D1050 and D1055
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So at the moment also after is ,reading is completed this flag is goes high the rising edge
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Okay then the block move we are moving this data
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six data from this D1050 to it starting from D300,301 
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d302,303,304,305..
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So read data stored in D300 to d305 and in here we are resetting
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this read  data from slave first time we read data from our vfd and this data readed and that
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moment it can be changed so already the output frequency is or the output current and the a lot of
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things are all parameters can be changed so we are resetting this data in here so we are resetting these
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read or write it is completed flags again and we are resetting M1129
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auxiliary relay bit , special bit also and we are going back to S0 so this is just for the 3.
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slave communication program imagine that ,this is just one function block and it is starting from
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here so you can put these codes to your function block or your program if you are communicating with
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a five device so you just need to change this address so we are now reading and writing with this
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from 3. vfd or 3. AC drive.
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So you can if you put here to two so that the address of 2 which address which drives or vfd  
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address is 2 we will communicate with it if you put in 4 which drives or AC drive or vfd addresses
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4 then we will communicate with it.
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So you can communicate with your vfds or drives or external devices via serial communication
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and you can write the frequency you can give a command to run forward or stop and run an etc. and
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you can monitor or read frequency,  output frequency and the current and etc. are complete list
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in here you can see them all with like this.
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This is the example of the communication between plc and the drives this was the first example.
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So see you in the next video there will be a second example about the communication about the modbus 
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communication for delta plcs.