Diagnostics Register Interpretation; Diagnostics: Return Query Data; Reading The Cim Configuration Register Block; Reading The Pit Water Level - Grundfos CIU 202 Functional Profile And User Manual

13.7 Diagnostics register interpretation

The diagnostics register is interpreted as follows:
Bit Description
0 Communication failure with the Grundfos product.
EEPROM self-test failed. The test is carried out when
1
system is booted.
2 Grundfos product not supported.
Modbus address offset is different from default value, i.e.
3
it differs from 0.
Using software-defined Modbus transmission speed
4
(Modbus RTU only).
5 RESERVED
6 RESERVED
7 RESERVED
8 RESERVED
9 RESERVED
10 RESERVED
11 RESERVED
12 RESERVED
13 RESERVED
14 RESERVED
15 RESERVED
A bit value of 1 means true, unless otherwise specified. The
diagnostics register is read using function code 0x08 and
subcode 0x02.

13.8 Diagnostics: Return query data

This function is useful to ensure that the communication path and
slave configuration are correct. It will echo the request in the
response.
In the example, slave address 0x01 is used.
Request from master to slave
Field Value
Slave address 0x01
Function code 0x08
Subcode 0x00
Data 0xAB
Data 0xCD
Example of response from slave to master
Field Value
Slave address 0x01
Function code 0x08
Subcode 0x00
Data 0xAB
Data 0xCD
If there is no response from the slave, see section
finding.
Description
-
Diagnostics
Echo request
Test data
Test data
Description
-
Diagnostics
Echo request
Test data
Test data
14. Fault

13.9 Reading the CIM configuration register block

This section shows how to read the first four registers of the CIM
configuration register block.
In the example, slave address 0x01 is used.
Request from master to slave
Field Value
Slave address 0x01
Function code 0x04
Start address HI 0x00
Start address LO 0x00
Quantity HI 0x00
Quantity LO 0x04
Example of response from slave to master
Field Value
Slave address 0x01
Function code 0x04
Byte count 0x08
00001 HI 0x00
00001 LO 0x0A
00002 HI 0x00
00002 LO 0x00
00003 HI 0x00
00003 LO 0x00
00004 HI 0x00
00004 LO 0x04
If there is no response from the slave, see section
finding.

13.10 Reading the pit water level

This section shows how to read and interpret the water level of
the pit. In the example, slave address 0x01 is used.
Request from master to slave
Field Value
Slave address 0x01
Function code 0x04
Start address HI 0x01
Start address LO 0x2C
Quantity HI 0x00
Quantity LO 0x01
Example of response from slave to master
Field Value
Slave address 0x01
Function code 0x04
Byte count 0x02
00301 HI 0x00
00301 LO 0xDC
A pit water level value of 220 [0.01 m] equals a water level of 2.20
metres.
If there is no response from the slave, see section
finding.
Description
-
Read input registers
Start address: 0x0001
Number of registers:
0x0004
Description
-
Read input registers
8 bytes follow
SlaveMinimumReplyDelay
: 0x000A
RegisterOffset: 0x0000
Reserved value:
0x0000
SoftwareDefinedBitRate:
0x0004
14. Fault
Description
-
Read input registers
Start address
(00301):0x012D
Number of registers:
0x0001
Description
-
Read input registers
2 bytes follow
Pit water level:
0x00DC (220)
14. Fault
45