modbus simulator for Unitronics

[roghenr]

Good afternoon.
I tried to use modbus Sim,Docklight for addressing tests but without success.
I saw in a post that to use modbus simulator I need to turn my vision 130 into slave.
I need some guidance.
Thanks.

[Flex727]

Does your simulator have the option to be either master or slave?

Which type of MODBUS are you using?

[Gabriel Franco]

You need add this piece of program to PLC (in case of Modbus TCP):

 

[Flex727]

@Gabriel Franco, I always just hang my MODBUS IP SCAN_EX FB directly on the left rail. Why do you include SB 2? Are you expecting the first PLC scan to cause a problem?

[Gabriel Franco]

Well, no. Just a programming way of one of my mates.

[Flex727]

👍

[roghenr]

18 hours ago, Flex727 said:

Seu simulador tem a opção de ser mestre ou escravo?

Que tipo de MODBUS você está usando?

I'm using modbus serial rtu.
I have modbus that simulates slave, but it doesn't work.
I wanted to use Vision 130 as a master in tests with VDF

[roghenr]

14 hours ago, Gabriel Franco said:

Você precisa adicionar este programa ao PLC (no caso de Modbus TCP):

 

14 hours ago, Flex727 said:

@Gabriel Franco, eu sempre apenas penduro meu MODBUS IP SCAN_EX FB diretamente no trilho esquerdo. Por que você inclui SB 2? Você está esperando que a primeira varredura do PLC cause um problema?

 

13 hours ago, Flex727 said:

👍

[roghenr]

17 hours ago, Gabriel Franco said:

Você precisa adicionar este programa ao PLC (no caso de Modbus TCP):

 

sorry I wrote wrong I'm using my vision 130 as a master and not as a slave

[Gabriel Franco]

PLC as Modbus RTU master (in this code, I´m using PLC port 2 as RS485, your case may be different):

 

Reading registers from the slave. You must use a N.C contact of FunctionInProgress in series with your own reading conditions:

[Ausman]

Gabriel, this is only minor, but I'm intrigued why you activate SB168 in the ladder itself, rather than simply setting it on powerup?

cheers, Aus

[Flex727]

15 hours ago, Ausman said:

Gabriel, this is only minor, but I'm intrigued why you activate SB168 in the ladder itself, rather than simply setting it on powerup?

It looks like he is doing both.

[Ausman]

Too true, missed that.  As I don't change IPs at any time, I was wondering whether it needed to be "redone" after a change, and maybe there were address changes happening elsewhere in the program which made it necessary.  Just curious.

[Gabriel Franco]

On 7/15/2022 at 6:35 PM, Ausman said:

Gabriel, this is only minor, but I'm intrigued why you activate SB168 in the ladder itself, rather than simply setting it on powerup?

cheers, Aus

Its the way to remember to myself and to my coleagues that its madatory to set it in all programs using Ethernet.

I set all requiered power up values in ladder rather than Visilogic option.