123
SCADA-Modbus
®
System Guidelines
950 SCADA-Modbus “No Response” Troubleshooting Flow Chart (5 of 5)
Returned values do not
match the values in the 950
display
Are you
SURE the correct
register addresses are
being requested for the
values you want
returned ?
Yes
Are you SURE
the Modbus device
address of the 950 is
correct ?
Does the
baud rate of the
950 match that of the
Modbus Server
?
Yes
Yes
Have
you configured
the Modbus server and or
MMI, to interpret the Channel
Data being returned as
floating point
values ?
Yes
e.g., If polling for flow,
are you requesting
register 40033 ?
Verify the correct register
addresses in Appendix H and
change the address of the registers
being requested as needed.
No
Check the Modbus
device address in the
Communications Setup
menu of the 950. Change
as needed.
Change the baud rate in
either the 950 or the
Modbus server so that
both are set to the same
baud rate.
No
Are the
integer values
for Units Of Measure
being returned
correctly ?
Use either a protocol analyzer or a
communications diagnostic program
running on a PC to intercept and verify the
Modbus response message from the
950
Make a note of the
Modbus message and
then call Tech Support
to have the
Modbus Response
Message validated.
No
Configure the Modbus server and
or MMI to interpret the channel data
being returned as 32 bit floating
point values. If you’re not sure how
to do this, contact the server or MMI
manufacturer for assistance.
No
NO
Have you
configured the
Modbus server and / or MMI
to interpret the Units Of
Measure as
Integer Values ?
Yes
Configure the Modbus server and
or MMI to interpret the values being
returned for Units Of Measure as
16-bit integer values. If you’re not
sure how to do this, contact the
server or MMI manufacturer for
assistance.
Yes
No
Содержание Sigma 950
Страница 2: ......
Страница 6: ...4...
Страница 20: ...18 Introduction...
Страница 34: ...32 Basic Programming Setup...
Страница 50: ...48 Sensor Installation...
Страница 82: ...80 Maintenance...
Страница 83: ...81 Appendix A Program Flow Charts Figure 22 Overview of Basic Program Menus...
Страница 84: ...82 Program Flow Charts Figure 23 Setup Flow Chart...
Страница 85: ...83 Program Flow Charts Figure 24 Options Flow Chart...
Страница 86: ...84 Program Flow Charts Figure 25 Alarms Menus Flow Chart...
Страница 87: ...85 Program Flow Charts Figure 26 Calibration Menus Flow Chart Page 1...
Страница 88: ...86 Program Flow Charts...
Страница 102: ...100 Programming Features...
Страница 106: ...104 Primary Devices Head Measurement Locations...
Страница 126: ...124 SCADA Modbus System Guidelines...