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Search: Posts Made By: danw
Forum: LIVE PLC Questions And Answers August 16th, 2018, 06:37 PM
Replies: 10
Views: 163
Posted By danw
Thanks for your comments on the message count. ...

Thanks for your comments on the message count. Somehow I missed the thread title - the 1400 is slave. I thought the 1400 was the PLC master and the count made no sense. As a slave, the msg counts...
Forum: LIVE PLC Questions And Answers August 16th, 2018, 07:43 AM
Replies: 10
Views: 163
Posted By danw
I don't get the Messages Sent/Received counts. ...

I don't get the Messages Sent/Received counts. The counts appear backwards. I would expect more messages sent than received from the perspective of the master, which presumably is reporting the...
Forum: LIVE PLC Questions And Answers August 16th, 2018, 07:38 AM
Replies: 8
Views: 291
Posted By danw
First ever review of a HART MUX product,...

First ever review of a HART MUX product, anywhere. Thank you.


Does this product have a port for each transmitter or do the transmitters have to run in multidrop loop that severely limits the...
Forum: LIVE PLC Questions And Answers August 15th, 2018, 09:05 AM
Replies: 8
Views: 241
Posted By danw
Modbus/TCP and Ethernet/IP can coexist on the...

Modbus/TCP and Ethernet/IP can coexist on the same link. I've done it.



I was under the impression that Profinet requires its own connection because its deterministic nature requires solo...
Forum: LIVE PLC Questions And Answers August 14th, 2018, 09:29 PM
Replies: 7
Views: 183
Posted By danw
>Using a pressure sensor on the 5mm coils I was...

>Using a pressure sensor on the 5mm coils I was only seeing a .2 PSI drop with one circuit blocked (50% blockage).


What's the pressure drop for a good tube?


20% of 1 PSI is 5.5" water...
Forum: LIVE PLC Questions And Answers August 14th, 2018, 07:40 PM
Replies: 11
Views: 166
Posted By danw
>Yes we have all that Great. Bypass the...

>Yes we have all that


Great. Bypass the repaired drive.

If drive #1 (first drop on the multidrop daisy chain) removed the wiring but keep it intact so it continues to pass Modbus messages to...
Forum: LIVE PLC Questions And Answers August 14th, 2018, 07:24 PM
Replies: 10
Views: 290
Posted By danw
Good luck finding published information on...

Good luck finding published information on 'upstream disturbance error' for any flow device.


There's an IEEE paper, but one pays to read it.


https://ieeexplore.ieee.org/document/7053301/n
...
Forum: LIVE PLC Questions And Answers August 14th, 2018, 06:37 PM
Replies: 11
Views: 166
Posted By danw
I missed Steve's reply while typing. ...

I missed Steve's reply while typing.

Typically, VFD drives are a Modbus slave/server, so the PLC is likely to be the Modbus master/client.

The manner in which Modbus works is
master polls...
Forum: LIVE PLC Questions And Answers August 14th, 2018, 06:18 PM
Replies: 7
Views: 183
Posted By danw
Differential pressure is not a bad idea. A...

Differential pressure is not a bad idea.

A 'standard' tube should drop some pressure due to the small tube size. Any increase in DP would indicate an obstruction. Any decrease and you probably...
Forum: LIVE PLC Questions And Answers August 14th, 2018, 06:02 PM
Replies: 10
Views: 290
Posted By danw
The AFG and the VGS Velocogrid both use averaging...

The AFG and the VGS Velocogrid both use averaging pitot tubes for volumetric air flow measurement (CFM). I have seen the use of two crossed lots of times, I was unaware of the VGS matrix until you...
Forum: LIVE PLC Questions And Answers August 14th, 2018, 04:19 PM
Replies: 8
Views: 156
Posted By danw
1. Natural gas pipe is not inherently...

1. Natural gas pipe is not inherently 'hazardous'.

The gas trains installed on gas piping (up to 4" pipe) for furnaces or process heaters do not typically require hazardous area rated...
Forum: LIVE PLC Questions And Answers August 12th, 2018, 10:27 PM
Replies: 8
Views: 291
Posted By danw
I feel your pain. On various occasions when I...

I feel your pain. On various occasions when I have been afflicted with insomnia, I have wasted those middle of the night hours attempting to discern both what HART/IP really is and attempting to...
Forum: LIVE PLC Questions And Answers August 3rd, 2018, 05:59 PM
Replies: 4
Views: 191
Posted By danw
Mickey's right. It's a value lower than 4.0mA ...

Mickey's right. It's a value lower than 4.0mA

From the Function Block manual:

ATTENTION
The failsafe detection on this input block configured for 4-20mA range is:
Low Detection:...
Forum: LIVE PLC Questions And Answers July 24th, 2018, 12:39 PM
Replies: 36
Views: 1,176
Posted By danw
My app note, Baker's Dozen Rules for reading the...

My app note, Baker's Dozen Rules for reading the Modbus Fault Code" from a Honeywell RM7800 flame safety controller covers some of the things you'll encounter with the Honeywell. Variables other...
Forum: LIVE PLC Questions And Answers July 24th, 2018, 06:13 AM
Replies: 5
Views: 432
Posted By danw
2 wire transmitters cannot be ranged to 0-20mA...

2 wire transmitters cannot be ranged to 0-20mA because a 2 wire transmitter uses about 3.5 or 3.6mA of current to operate its own electronics. Without the 3.6mA of current 'below' 4.0mA, a 2 wire...
Forum: LIVE PLC Questions And Answers July 10th, 2018, 11:40 AM
Replies: 4
Views: 276
Posted By danw
Modbus is a master slave protocol. The master...

Modbus is a master slave protocol. The master sends formatted instruction messages via Ethernet (via a port). If the message is addressed to the slave, then the slave interprets the message and...
Forum: LIVE PLC Questions And Answers July 5th, 2018, 02:59 PM
Replies: 16
Views: 998
Posted By danw
I think a commercial Modbus solution is a dead...

I think a commercial Modbus solution is a dead end because the commercial products are not made to operate at the throughput rate you need.

I've sat through some Profinet promotions and they...
Forum: LIVE PLC Questions And Answers July 3rd, 2018, 08:46 AM
Replies: 8
Views: 364
Posted By danw
You need to read the manual. The manual...

You need to read the manual.


The manual for that card is here:
http://literature.rockwellautomation.com/idc/groups/literature/documents/um/1794-um007_-en-p.pdf


Page 1-3 (pdf pg 13) says...
Forum: LIVE PLC Questions And Answers July 2nd, 2018, 10:20 PM
Replies: 8
Views: 364
Posted By danw
If the T/C is connected backwards a hot junction...

If the T/C is connected backwards a hot junction 'hot' voltage output is seen as 'negative' and will indicated temperature will be drive downwards as the T/C is heated. If the T/C hot junction is at...
Forum: LIVE PLC Questions And Answers June 22nd, 2018, 06:31 PM
Replies: 10
Views: 393
Posted By danw
Updating the development software is an Excellent...

Updating the development software is an Excellent place to start.

Updates are free downloads, but difficult to find
...
Forum: LIVE PLC Questions And Answers June 22nd, 2018, 01:29 PM
Replies: 10
Views: 393
Posted By danw
It's been so long since I used serial, I can't...

It's been so long since I used serial, I can't remember the Gotchas. Why aren't you using the controller's default Ethernet port at 192.168.1.254?
Forum: LIVE PLC Questions And Answers June 21st, 2018, 09:21 PM
Replies: 8
Views: 529
Posted By danw
Honeywell has a mark the chart feature. Keyboard...

Honeywell has a mark the chart feature. Keyboard shows up on the touch screen and the message appears both on the trend chart and as an event message with the logged data. Or if the messages are...
Forum: LIVE PLC Questions And Answers June 21st, 2018, 09:18 PM
Replies: 1
Views: 225
Posted By danw
Fluke 773 clamps around one of the conductors to...

Fluke 773 clamps around one of the conductors to read the current.


The other Fluke has to be in series with one of the 4-20 lines, requiring opening the circuit at one point and inserting both...
Forum: LIVE PLC Questions And Answers June 21st, 2018, 08:59 PM
Replies: 5
Views: 572
Posted By danw
I suspect you'll have to find a vendor who...

I suspect you'll have to find a vendor who attaches a conventional RTD "tip" (the sensor) to a flexible sheath (the kind the bore scope/endoscope camera is attached to) and then runs the lead wire...
Forum: LIVE PLC Questions And Answers June 19th, 2018, 12:15 PM
Replies: 3
Views: 202
Posted By danw
I would recommend using the search function (not...

I would recommend using the search function (not the Google search, the site search above it) to see what’s been written about Maco over the years.
Showing results 1 to 25 of 500

 
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