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The reason for increase in indicated temperature readings is due to the method used to get an RTD reading. The AI card generates a constant current. The current flows through the wiring, wiring connections and the RTD itself. Currect flowing through a resistance creates a voltage drop, by...

Unless the DCS vendor has implemented an upgrade to 6-digit addressing that you are willing to pay for, the approach is to use a gateway box with internal remapping functionality so that what the gateway reads at a 6-digit address can be remapped to an internal 5-digit address. The master...

Referring to the illustrated Figures in the HC-900 spec sheet here https://prod-edam.honeywell.com/content/dam/honeywell-edam/pmt/hps/products/pmc/modular-systems/controledge-hc900/pmt-hps-51-52-03-31-hc900-controller-jan22.pdf If you have redundant controllers (Figures 7 or 8), then software...

1. Do you know if all standard modbus work at 5V? It’s actually -2.5 to +2.5 that Im sending since it is a 5V device. Perhaps the cut off is at +-5V? Answer: The plus/minus 2.5V is part of the RS-485 hardware bus spec. Modbus is the protocol, the set of rules (who talks when, how com is...

1. The Modbus spec says that the required parity is to be EVEN parity, although ODD or NONE can be optionally offered (that's not necessarily implemented by every vendor). But just in the case that this device implement EVEN parity and only EVEN parity, try 8E1 instead of 8N1. 2. A quick...

I'd opt for the meter first, because the local bubba can usually come up with a screwdriver even if they don't have a meter on-site. But I always carry my own meter and screwdrivers

If E&H doesn't tell you how to fix it, then you're on your own. Pressure transmitters have two typical failure modes. Either the pressure sensing element fails or the electronics fails. If you have enough faulty transmitters you can swap electronics modules with a known good pressure...

Is this an automation topic?

A proprietary protocol from 15 years ago? A long shot, indeed.

Why the number 16 instead of the number 1? It all depends on how the number 16 (decimal) is interpreted in the program. I have no familiarity with any turbine/Mark control system, but would assume that the single bit 1 in the integer 16 (binary 00010000 in an 8 bit unsigned integer) in its...

Probably not, but what do have to lose by trying that?

Because Experion is a Honeywell DCS label and the facts of life are that the DCS world does things their own way, I don't know whether an "Experion HMI" is getting its tags and data from a DCS server on a live update basis or whether an Experion HMI operates like a conventional HMI that is...

>then I recommend trying a computer with Modbus simulator software and a USB to RS-485 adapter. Me, too, because the Modbus simulator does the decoding so you read hex or decimal numbers to know what's going on, instead scope waveforms.

Thanks for the explanations. D'oh. Of course, H' is notation for hexadecimal; instead 0x or 0e or (hex). I missed that one. You're so right.

What material-of-construction will the 1/2" piping for the high side be in order to deal with the corrosion? The high side impulse would be liquid filled, but it is dead-headed (no flow, liquid acts as pressure transmission medium) so with no flow, the impulse tube cools its contents over...

jschulze, Where did you find the default factory setting as ASCII as the comm protocol? I spent a half hour looking for that tidbit and couldn't find it ! ! ! It is really meaningful to know what the default protocol is, otherwise it's trial-and-error time. Have you worked with Delta...

Can you share with us what the resolution was?

The previous posts in this thread seem to conclude that JIC has been dissolved with other standards taking their place.

Rotork's approach to maintenance seems pretty common amongst industrial vendors nowadays. Their IQ Range series installation and maintenance manual goes into the mechanical maintenance items needed - lube fluid levels, and 3 pages of illustrations and text on the removal and replacement of a...

Silicon Labs has their own community forum groups which might be targeted for issues with that MCU chip https://community.silabs.com/s/topiccatalog?language=en_US