14.2.2 CIM/CIU 260 3G/4G cellular communication faults
Fault Possible cause Remedy
The slave does not respond to telegrams.
Configuration or installation error.
• Ensure that CIU 260 has connection to the
cellular network. LED1 must be pulsing yellow. If
the LED1 signal is incorrect, see section CIM
260 3G/4G cellular Modbus setup for correct
installation of the CIM 260.
• Ensure that the correct slave address is used in
the Modbus master poll.
See register 00003
SoftwareDefinedModbusAddress (factory value
is 00231).
The slave may be in listen-only mode.
Either send a restart communications diagnostics
command, or restart the E-pump manually.
If the holding register of address 00001
"SlaveMinimumReplyDelay" is set too high, the master
may time out before receiving the response from the
slave.
Increase the reply delay in the master, or reduce the
"SlaveMinimumReplyDelay" in order to
communicate.
The slave responds with exception response 0x01:
"Invalid function".
The master is trying to use an unsupported function in
CIM/CIU 260.
See section Modbus RTU telegram examples for
supported function codes. Note that reading and
writing coils are not supported, so only register
functions and diagnostics are valid.
The slave responds with exception response 0x02:
"Invalid data address".
The master is trying to read or write an invalid data
address. If a master tries to read register addresses
that are not listed in the tables, the slave responds with
this exception response. Some masters may
automatically try to read large blocks in one telegram,
which will cause problems if some of the registers in
the block are not supported. An example would be
reading the CIM configuration and CIM status register
blocks in one telegram. This is not possible since there
are unused addresses among the blocks.
Avoid reading or writing invalid data addresses.
Make sure that register X is addressed as X - 1 in
Modbus telegrams, according to the Modbus
standard.
The slave returns data value 0xFFFF (65535).
The availability of data will in some cases depend on a
configuration or the actual conditions of the system.
For example trying to request data from an E-pump
which is not present will return "data not available"
(0xFFFF)).
See section Modbus register addresses for available
data.
With its present configuration or operating mode, the
E-pump is unable to supply the requested data.
See section Pump data register block for data
values that require a sensor.
The slave does not react to control actions or to
writing of settings.
CIU 260 is SCADA PIN-code-protected (GeneralStatus
register 00029, bit 0: 1), and an incorrect PIN code has
been written.
Write access requires a correct PIN code
(ScadaPinCode, register 00011). Writing the correct
PIN code value triggers the write access control,
and write access is open, which can be verified with
GeneralStatus, register 00029, bit 1: 1.
Related information
6. CIM 260 3G/4G cellular Modbus setup
9.7 Pump data register block
13. Modbus RTU telegram examples
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