from the instrument department...SCADA communication with Yokogawa UT35A controller
Using SCADA communications with a UT 35A controller
The 3rd digit in the model number defines which comm protocol/transport layer your 35A has. none,...
from the Forum department...level control in grain silo
What do you use to monitor the level of grain in a silo?
The Siemens LR560 radar was made for grain silos. Its start-up wizard even asks whether the...
from the Forum department...Actuators requiring 50 mA current
How do actuators requiring 50mA current work?
2 wire, loop powered, 4-20mA field transmitters use approximately 3.5-3.6mA to run the device's...
I think you've answered your own question; whatever device is using a 50mA control signal needs...
from the None department...Explosion proof loop in NEMA 4X junction box
Using an Explosion proof loop in a NEMA4x Junction box
from the Shiplift department...Malfunction of Analog Input Module
Problem related to Siemens analog input module
What kind of load cell do you have that outputs a milliamp signal? Most load cells have a...
from the Forum department...Signal conditioner
200 mA input signal conditioner?
The API 4300 G spec sheet says it has an input range up to 900mAdc and a selection of conventional...
from the R&D department...Help with MODBUS Address
Help needed with writing a bit (true/false) to a modbus adress
The inverter/drive is a Modbus slave. You need a Modbus master to initiate a write command to...
from the Forum department...MODBUS memory-map requirements
Minimum requirements for memory-map.
Do you have some means of configuring the slave address? DIP switch? One thing that's missing...
from the Communications department...How do OPC works?
How do OPC works and what are the differences with other protocols?
In OPC, the OPC server has the low-level driver that talks the comm protocol of the field device. ...
from the Measurement department...Measuring pressure & temperature in circular pipes
How do I calculate straight length requirements for pressure & temperature measurements in a pipe?
I knew I'd seen a reference to a pressure tap location spec somewhere but it took a day to recall...
For temperature, you get the temperature for point in the flow profile the tip of the thermowell...
from the Forum department...Forced balance temperature transmitter span calibration
Forced balance temperature transmitter calibration
If it's a true force balance transmitter, the style with the diaphragms stacked on "top' of...
from the E&I department...Problem with copco MKIV gateway using rs 485 to rs 232 communication
Illegal response message from Modbus from atlas copco MKIV gateway which is CAN to rs485 wired to rs232 converter to a pc.
I've heard that JBus is a minor derivative of Modbus, but I had never heard that the CAN protocol...
from the Forum department...default slave id configuration
How to setup the default slave-id when shipping device to customers.
Anyone who implements Modbus (or any protocol) routinely expects to configure a slave address on...
from the Instrumentation department...Thermocouple Extension wire and thermocouple type mismatch
Is it possible to connect j type thermocouple with k type extension wire up to transmitter?
The bad data from mixing wire types makes me shudder. You can't dig up some J wire to do it right...
from the software department...modbus floating point format
Is it mandatory to use IEEE Format for representing floating point in 2 16bit registers?
I love Banner Engineering's documentation because they explicitly provide the format and then give...
from the Engineering department...Cables For 4-20ma signal from Transducer to SCADA Interface Panel
Using Multicore cable for 4-20ma signal from Transducer to Scada Interface panel.
Why not? According to my chart, 1 mm2 is a size somewhere between 18 and 16 AWG. That's more...
from the Instrument department...Redundant Server vs Dual Redundant Server
is there any difference between the two things in the subject?
If Rosemount can, why not you, too? pg 13, 3144P manual: Hot Backup® provides temperature...
from the Instrumentation department...Communication between a HART transmitter using DRUCK DPI 610 24 voltage power source
How to calibrate and communicate HART transmitter along with 475 communicator using DRUCK DPI 610 24 voltage power source?
We must have found different manuals on the web. The manual I found for the Druck DPI 610 (User...
from the Instrumentation department...Differential Pressure Teasing Question
For the trapped flow through the orifice, will any differential pressure be created?
No, the DP across an orifice plate will diminish as the static pressure equilibrate in its closed...
from the Process Control department...Watlow F4 not being detected
Watlow F4D will communicate with one computer but is not detected on another.
> There's no option with the card to turn off the flow control, Isn't flow control done in...
from the Forum department...HART communication
HART multidrop limitation
The limitation is a HART 5 limitation, according to the HART Foundation's HART Communication...
from the Forum department...Modbus rtu over rs232, Master sending requests continuously
No mention of this possible scenario in specification.
The diagram on page 4 of the Modbus Application Protocol Specification V1.1b shows the client...
from the Forum department...Voltage drops in a 2 wire transmitter
Voltage drops to 5V after connecting the i/p terminal to the sensor. Sensor is basically a RI converter .
> 24v DC i/p is given from PLC I'm confused. An I/P should be connected to a PLC analog...
from the Forum department...IS Barrier Circuit
How to identify IS Barrier Circuit in a existing system?
The Whessoe 01146 spec sheet says ATEX approval: - Category: Ex II 2(1)G - Marking: EEx...
Intrinsic Safety is one approach to dealing with electrical apparatus in hazardous areas. ...
from the Instrumentation and Control department...HART Pass Through IO Cards
HART Pass Through IO Cards
One might assume that any HART enabled analog input card would be able to deal with the primary...
from the Anyway will do department...PLC Rack Layout
Project group wish to install a new rack above existing racks. Would like a standard to refer to for correct installation. Manufacture, though opposed, do not have written objection as it can be done.
In 30 years, I have never encountered a blind or illiterate PLC technician. If the techs at...
from the Forum department...Communicating using a RS-485 device to ASCII or Modbus
RS-485 can be set in eiher ASCII or Modbus mode
The manual says that the module defaults to Modbus RTU on power-up (pg 45). The mode can be...
from the New student department...Thermocouple compensation
How does compensation cable used with thermocouple, and can someone brief to me how does a smart transmitter compensate the unwanted voltage in thermocouple system?
The thermocouple law of intermediate metals says that junction terminal strips for thermocouples...
from the INSTRUMENT department...Hastelloy"C" material in 33% HCL
Seal diaphragm material HASTELLOY"C" IN 33% HCL service
A bulged out diaphragm is the condition that appears from hydrogen ion migration, when hydrogen...
from the automation department...Alpha Omega TEC controller series 800
Need help programming the Alpha Omega TEC controller series 800 using RS-232 (Modbus protocol)
Software and RS-232 in today's world means using a USB/RS-232 converter, unless you're using an...
from the level instrument department...Ultrasonic level transmitter on humid tank
level sensing value is fluctuating for ultrasonic level transmitter installed on the humid tank.
Moisture on the face of a transducer is a known problem with ultrasonics. The temperature of the...
from the software department...Modbus device discovery with many Slaves.
How do we handle device discovery/configuration of slave-ids with Modbus-RTU with multiple slave nodes (from different vendors) on a RS-485 bus ensuring no duplicate nodes.
> What do large EMS companies do when they have multiple devices from different companies to...
from the Forum department...Serial RS232 over Ethernet
What would you recommend for communicating with a serial RS232 based device over a local LAN network?
My memory of serial printers was that they needed flow control - small buffer memories and...
from the Loop Power department...Loop Powered device not turning on
Loop Powered device not turning on, V too low?
250 ohms is a low load value for an analog output. It only takes 5Vdc to drive 20mA through 250...
The Metso ND9000 spec says: Load voltage: up to 9.7 VDC/20 mA, (corresponding 485 ohms) So when...
from the Forum department...OPC via Modbus
Connect OPC via modbus.
>based on the FTDI chipset. I second the nomination of the FTDI chipset. Just today I...
>based on the FTDI chipset. I second the nomination of the FTDI chipset. Just today I...
from the Automation List department...Source / sinking problem
PLC analog sinking module and sensor is also sinking
Whoops, took a closer look. Correction to the diagram. Wiring should be 24Vdc (+) to Sensor...
Assuming that the symbols at the 24Vdc power supply are (+) and (-), what you drew is a classic...
from the Control valves department...Info on valve other than HART protocol
How can I change the parameters of Fisher Valves?
You don't say which positioner you have. Some positioners have keypads and a menu. But if you...
from the Arrgh, bloody gremlins department...problematic RTD displays
Five RTDs in use on three vessels. Display fine on two controllers, not on the others.
You should look up the part number on the relays that switch the RTD signal and make sure that the...
It isn't clear to me exactly what the problem, "all over the map" means (no examples...
from the Electrical Instruments department...OPC Server
Three Slave device sent data through modbus TCP or RS485 to OPC Server
OPC was originally promoted as an alternative to DDE, a Microsoft protocol for communicating with...
from the Forum department...Constant downstream pressure across HP valve
Constant downstream pressure across HP valve
Sounds like a conventional pressure regulator to me, with the inherent proportional droop in flow...
from the Design department...Condensate Pot for Pressure Transmitters
Hookup design of pressure transmitters for steam application.
The idea is to - have two condensate pots, one for each impulse leg, at exactly the same...
from the Forum department...Remotely process and pump control
Specifying a low pressure switch/transmitter to de-energize two upstream pumps.
Electromechanical pressure switches need no power to operate, the line pressure on the sensor...
from the Forum department...Books on distributed control system
Looking for books on distributed control systems
Practical Distributed Control Systems (DCS) for Engineers and Technicians IDC Technologies. - 569...
"The sooner all the animals are dead, the sooner we'll find their
-- Ed Bluestone, "The National Lampoon"