Gabriel Franco
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Posts posted by Gabriel Franco
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26 minutes ago, Fernando Castro said:
I haven't been able to use Modbus like that, I am not sure if I am doing something wrong or if my devices just don't work over UDP.
First of all, not all devices accept UPD.
28 minutes ago, Fernando Castro said:Is the same? should I Initialize the socket then connect to an IP and then need to use the Modbus functions just polling through my different devices changing IP and Modbus requests?
or I need to connect toe each device first without disconnecting?
or not use socket connect at all?
Initialize Ethernet, Modbus and socket as usual.
There is not need to connect/disconnect to/from each slave.
As you mentioned, just select a slave index and use Modbus FB to poll trhough all slaves.
It may be necessary to add a little delay between devices (in my experience, minimum 100 ms), because of the fact of not having all datagram control present in TCP. However, this delay compared with connect/disconnect times makes UDP by far better than TCP in the overall performance.
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If you have only one slave, I don´t see the reason to connect/disconnect the socket.
Remember to set SB 168 at power-up.
Consider to use UDP, then you don´t need to worry about connection.
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1. Create a new tag buffer type (array long enough to hold string lenght) and a new tag string-ascii type.
2. Create a new Modbus operation using buffer name.
3. In ladder, use copy buffer to tag.
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The following message is displayed on the screen sporadically:
PLC Date/Time
Date and time was set automatically to local time
Press OK to continue
The time and date do not change when the message is displayed.
What does it mean?
USP-070-B10 + USC-P-B10
Unilogic 1.33.236
PLC is connected to Internet, time auto-sync enabled.
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Try 4 instead of 40004 (and so on) in address.
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A common mistake some of us had made and you may double check: ethernet cable connected to ethernet port instead of Expansion port.
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As Kratmel mentioned, change all continuous HMI display calls to single call.
Change from this:
To this:
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I tested it and you are right. In my opinion, this is a bug .
@Saragani Can you check it?
I haven´t used TA in UDFB before, only TD or counters in ms, the last method to be able to pass "timers" to the UDFB when input parameter is a struct.
If possible, call the functions without conditions.
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To whom may be interested:
answer from Unitronics Support:
"No option to force on power up, you can configure a tag with power up value and store the value to the output".
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VNC will meet your requirements. You can acces the PLC from multiple clients at the same time (but they will all see the same screen). It is also possible to configure two types of access: full control or view only.
Delays depends on number of elements of each display.
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Is it possible to keep forces after power-up?
I´m using USP-070-B10 + USC-P-B10 with some IO. Forced some inputs and outputs via Uniapps but after power-up all forces are deleted.
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You can use implied decimal.
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In my projects, unlike my colleagues, I always use timers instead of counters.
Reset timer at power-up checkbox means, timer will start over from preset value down to 0 if conditions are met no matter what preset is, if the originally downloaded or any modification you made online or from HMI. This is at least the behaivour I've seen in TD. This scenario is probably differente to TA and TE, due to their inherent retentive operation mode. Rarely I use TA nor TE so I cannot answer it.
About prest value resetting to 0, I experienced the same thing one time, but it was caused of electrical spikes.
In my projects I always use timers instead of counters.
Resetting the timer in the power-on checkbox means the timer will start again from the preset as long as the conditions are met, no matter what preset it is, the one you originally downloaded, or any modifications you made online or from the HMI. This is at least the behavior I've seen in TD-like timers. This scenario is probably different from that of TAs and TEs, due to their retentive mode of operation.
I rarely use TA or TE, so I can't answer for sure.
About resetting the value to 0, I experienced the same thing once, but it was caused by electrical spikes.
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I´ve had this problem in the past. The solution to me was to change the port number (12 in the image) in device manager (Windows side) to a lower port. Currently I use port 4.
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Try this code:
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I would use a machine state using an MI register to track the current step of each slave, e.g.:
10=reading slave 1 group 1, waiting for response.
12=no response slave 1. Jump to slave 2.
14=response ok slave 1 group 1. Process data
15=reading slave 1 group 2, waiting for response.
17=no response slave 1. Jump to slave 2.
18=response ok slave 1 group 2. Process data
20=reading slave 2, waiting for response.
...
In my applications I´ve not needed to add delays between slaves.
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I´m not sure what you mean.
As a reference, I use this method.
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Thank you.
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FIFO data tables are not populated while online.
Also, the read and write buttons are disabled.
Is this normal?
Unilogic V 1.33.236.
PLC: USP-070-B10
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I haven´t reviewed the program but, you mentioned Modbus RTU (serial) and are trying to communicate over Ethernet.
Has the actuator Modbus RTU or Modbus TCP protocol?
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Post your code to take a look.
It can be a myriad of things, most probably the protocol definition
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Since you want to share datatables between different PLCs, the easiest (easy in terms of a few lines of code) way I see, is to write DT from the source PLC to a SQL database, then any other PLC can retrieve data in any time asyncronously. For reference, my PLC program toom about 330 scan cycles to INSERT 50 rows.
If you want to go faster, you would use Ethernet/IP, sending the entire data table (row by row) to each destination PLC.
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I´ve used conditional return from subroutines with no problems at all.
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Only in Uniapps as long as I know.
Access UINT16 data from EIP EDS files
in UniLogic Software
Posted
As you create EIP Scanner using EDS files, the tags are created automatically.
You can access them as a regular tag, in your case should be EDS_GC_Series_Input.p_30th detailed error code
Individual bits inside UINT tags, cannot be directly accesed. Use Test Bit FB.