AC500-ECO Communication Modbus RTU With other Devices .

Hey Friends , I have to connect AC500-ECO with ACS550 VFD And Satec PM130E power meter i tried to do that , but it did not work , i used TA562-RS >> COM 2 in ECO PLC , so any one can help me with that ?

Here is the program which i wrote

and i wonder is there any (TX, RX) indicator in the plc eco or he vfd to know if the communication is ok or not , and if there is no indicator how could i know if the communication ok or not , for example in fatek rs584 card there is an rx,tx indicator and if the communication ok these indicator start flasher .

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akhraszaid Rank: 204

Asked 9 months ago

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Hi,

1. If I can see well, you are trying to read and write in the same start address (ADDR=0). That is not correct
Try first only with read block.

2. I'm not quite sure if your logic for block EN is working well - ensure that you have a regular pulses (requests) in both EN inputs.
The simplest method to try is EN:=not DONE and not ERR

https://forum-controlsystems.abb.com/...

3. For check if COM port is working, look for DONE, ERR, ERNO (done and err are true only for one cycle after request EN)
COM2 has no LED for Rx/Tx

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by akhraszaid Rank: 204 on 10/3/2018 3:51:40 PM | Like (0) | Report

Hey
Thank you very much for your help i really appreciate it .
now i can read all data i need from the ACS355 using COM_MOD_MAST , Now i have 4 question if you please :
1. how can i read and write at the same time using com_mod_mast, i mean what is the suitable logic for block EN in COM_MOD_MAST Read and COM_MOD_MAST Write.
2.I have two Slave in my project one for ACS355, the second for Satec Analyzer So for Satec do i need to make another COM_MOD_MAST to read from Satec Analyzer ? or just what i need to do is to change the slave address in the same COM_MO_MAST Which i have already built to read from the vfd , and if yes how can i do it ?
3.In COM_MOD_MAST)(Modbus_Read) that assigned in the picture above i made array (Read_Data) to read data from the VFD now How can i use these data , For example Data number 4 how could i use it in MOVE Function Block , Or Take these data into CP607 HMI .
4 . The last question
In my application I have CP607 HMI Anad pm564 eth CPU , to control a water pump, So the operator need to put a presser setpoint(Using HMI CP607) and if the presser become greater than the setpoint the pump Will be shut off , every thing is ok until now , assume the setpoint presser is 1.2 bar and we enter it using HMI , but when we re-power the plc this value become zero when the plc run again and this is a problem because the operatore need to re-enter it again, i assigned the setpoint vale in the cpu program as local variable type of INT , My question is : how to let The CPU Save and remember the setpoint value even when we turn off the power on the PLC CPU .

by kstoilov AKS expert

Rank: 5 on 10/4/2018 12:38:45 AM | Like (0) | Report

Hi,
1. For read and write to the same slave, you will need two COM_MOD_MAST blocks, one with FCT=3 and the other with FCT=16 for example. Both blocks have to be to the same slave address, with specific Start address, depending on slave's mapping. The blocks can use EN inputs as described, or better consequent - for the second COM_MOD_MAST EN:=DONE or ERR of first block, then for the first COM_MOD_MAST EN:=DONE or ERR of second block. Of course, you need to ensure the initial EN for the first block, when first cycle of the program is executed, after power on of the PLC, with R_Trig for example.
2. For the second slave you will need third COM_MOD_MAST block. As principle - separate COM_MOD_MAST for each operation (read or write) to the same slave, and a separate block(s) for each slave. I don't use dynamic change of slave address or other parameters of COM_MOD_MAST.
3. Variable_X:=ARRAY_NAME[3] = you will read the 3-rd element of the array.
In your case, variable_3:=Read_Data[3]
4. The panel could not store a variables during power off, you have to organize that in the PLC.
Make your Setpoint variable in the PLC, which stores it, of type RETAIN PERSISTENT.
Then only in the first cycle of the program, assign %MWx.x (from the panel) = Setpoint_Variable (in the PLC, RETAIN, PERSISTENT).
After that, except the first cycle, assign Setpoint Variable (RETAIN, PERSISTENT):=%MWx.x.
In this way during the first cycle, you will send the stored setpoint from the PLC to the panel, then you can read it from there.
In order to detect first cycle, you can use block TASK_INFO for example

by akhraszaid Rank: 204 on 10/11/2018 9:39:51 AM | Like (0) | Report

thank you , today i test all thing and every thing was ok , thank you again

by kstoilov AKS expert

Rank: 5 on 10/11/2018 1:46:38 PM | Like (0) | Report

OK, you are welcome. Nice to hear you get success.
If the answer is satisfying you, you can vote on it, in ordre the other users to know it is working solution
BR/

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kstoilov

Rank: 5

Answered 9 months ago

Hey!

To check if there're packets coming to ACS550 drive you may check out parameters in group 52 on drive's panel. They show number of messages received, sent, and various types of faulty ones.

If the drive receives messages and sends something back - then it might be something wrong with your program, if no messages are coming - problem could lay on physical level (cable, terminating resistors, polarisation etc.)

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Iurii Kuzmich Rank: 513

Answered 9 months ago

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akhraszaid Rank: 204

Answered 9 months ago

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AC500-ECO Communication Modbus RTU With other Devices .

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