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14

GF U3000 V2 Ultrasonic Flowmeter

Modbus Supplement to the operating instructions

3.9 

Status Flags

Various status flags that have not been discussed earlier, are outlined in the register map in Figure  above, but are also shown below 
along with a more verbose description of their use.

Element

Bit name

Description

Instrument Control Flags

Lock screen mode

This is a Read/Write bit. When read, it indicates whether the Lock Screen 
Mode on the unit is on (=1) or off (=0). To change the Lock Screen Mode, follow 
the procedure outline in 2.6.2 but substitute step 3 and 4, first with a MASK 
WRITE REGISTER message (command 22 or 0x16) to register address 6 
(address 5) and the OR set as appropriate to set to Lock screen Mode. This is 
followed by another MASK WRITE REGISTER message (command 22 or 0x16) 
to register address 6 (address 5) with the AND mask being set to 0xFFFB and 
the OR mask being 0x0004. This will initiate an “Update Lock Screen Mode” 
command on the unit.

Instrument General 
Flags

Screen lock mode active This flag indicates that the unit is reading flow, lock screen mode is enabled, 

and the keyboard is locked against local entry for the moment.

Status Flags

Online

The unit is currently reading flow. This flag is reset when the unit stops 
reading flow and enters the configuration mode.

Status Flags

Urgent Error

An urgent error has been reported. This can be useful to indicate that a 
serious error has occurred in the unit. For a list of urgent errors see the GF 
U3000 V2 Ultrasonic Flowmeter manual.

Status Flags

Remote Total Changes 
Disabled

A local operator has temporarily barred the MBM from changing the flow 
totals.

Status Flags

Current Loop Alarm

An alarm condition has been set on the current-loop and the conditions that 
trigger it has been met.

Status Flags

Digital Device 0 .. 3

N.B. Digital device 0 is currently unimplemented, and so will always read 
zero. Digital device 1..3 correspond to output 1..3. If a flag is set then this 
output has been configured as an alarm, and the alarm condition has been 
met.

Status Flags

Hot / Cold probe fault

The hot or cold probe is faulty or has been disconnected. The temperature 
associated with a faulty or disconnected probe will -259.3 °C

Status Flags

Signal Loss

The ultrasonic signal has been lost. Flow and volume readings will be frozen.

GLOSSARY

Below is a list of abbreviations and their meaning:

Abbreviation

Meaning

MBM

Modbus Master

SP

Single Precision

DP

Double Precision

REG

Register

IDX

Index

Summary of Contents for U3000 V2

Page 1: ...er 2026161 F U3000 V2 Modbus Supplement MA_00138 EN 00 07 2022 Georg Fischer Piping Systems Ltd CH 8201 Schaffhausen Switzerland 41 52 631 30 26 info ps georgfischer com www gfps com 7 Units 4 Velocit...

Page 2: ...dentification 13 3 9 Status Flags 14 4 GLOSSARY 14 Original instruction manual Disclaimer The technical data are not binding It does not constitute expressly warranted characteristics and neither guar...

Page 3: ...the next unit It is the responsibility of the user to install cable and wire to the MULTICOMP MP002510 Modbus plug connector The connection diagram is shown below in Figure 1 Note that the connection...

Page 4: ...for the GF U3000 V2 Ultrasonic Flowmeter The Modbus specification for RTU mode defines an 11 bit character frame containing an 8 bit character If Parity is used then only one stop bit is required If...

Page 5: ...ssages The following message types are supported from the Modbus Application Protocol Specification Message Type Message Number Notes READ HOLDING REGISTERS 03 0x03 Read a contiguous block of register...

Page 6: ...of the mantissa are stored in the higher address Some registers below contain bit mappings These values may be manipulated via the MASK WRITE REGISTER command 22 as outlined in Table 1 Bit fields are...

Page 7: ...value Interface version uint16 0x5A00 R This is a check value and an interface version number This version is zero All values start at the base 0x5A00 2 1 Device ID uint16 GF U3000 V2 Ultrasonic Flow...

Page 8: ...12 MBM to control digital output s on a unit 12 100 Reserved uint16 Sec 6 RZ 0 to 59 101 102 100 101 Date Time uint32 Min 6 R 0 to 59 Hour 5 0 to 23 Day 5 1 to 31 1st 1 Month 4 1 to 12 Jan 1 Year 6 b...

Page 9: ...d 13 Reserved allocation of 13 LS bits of reg 133 Hot probe fault 1 Faulty or disconnected hot probe Cold probe fault 1 Faulty or disconnected cold probe Signal Loss 1 Device is online and has lost si...

Page 10: ...Registers Registers highlighted as RW are updateable They provide the ability to update the unit s configuration Except for the Regime regis ter register 5 offset 4 all updateable registers can be up...

Page 11: ...lags associated with them Values can be written into these registers but no action will be taken until the associated flag is activated There are three key flags that must be considered when updating...

Page 12: ...uint16 year month day hour minute second Read the time and date starting at register offset 8 timeNdate Read2HoldingRegisters 8 Extract elements second timeNdate mod 2 6 timeNdate timeNdate div 2 6 m...

Page 13: ...address 136 with the AND mask being set to 0xFFEF and the OR mask being 0x0010 This will start the update 5 Send a MASK WRITE REGISTER message command 22 or 0x16 to register address 5 with the AND mas...

Page 14: ...entry for the moment Status Flags Online The unit is currently reading flow This flag is reset when the unit stops reading flow and enters the configuration mode Status Flags Urgent Error An urgent er...

Page 15: ...15 GF U3000 V2 Ultrasonic Flowmeter Modbus Supplement to the operating instructions...

Page 16: ...td Unit 2501 U Tower 120 Heungdeok Jungang ro Yeongdeok dong Giheung gu Yongin si Gyeonggi do Phone 82 31 8017 1450 Fax 82 31 217 1454 kor ps georgfischer com www gfps com kr Malaysia George Fischer M...

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