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15.4 Reading the pit alarms
This section shows how to read and interpret the three alarm
registers of the pit. The pit alarms start at Modbus register
address 209 = 0x00D1.
In the example, slave address 0x01 is used.
Request from master to slave
Example of response from slave to master
If there is no response from the slave, see section 16.1.2 CIM
200 Modbus communication faults.
When reading the three pit alarm registers, the following data
becomes available:
Pit alarms 1 = 0b 0000 0000 0000 1000
Pit alarms 2 = 0b 0000 0000 0000 0000
Pit alarms 3 = 0b 0000 0000 0000 0000.
As seen from the alarms table, the bit for dry-running alarm is set
in pit alarms 1.
15.5 Setting pit auto mode
This section shows how to set "Auto" mode in the CU 36X.
In the example, slave address 0x01 is used. Note that the register
is reset by the CIM 200 when the command has been
acknowledged. The value is only triggered on rising edge.
The register on address 00101 is set to the following:
Hence the value to set is 0b000000000100000 = 0x0020.
Request from master to slave
Example of response from slave to master
If there is no response from the slave, see section 16.1.2 CIM
200 Modbus communication faults.
Field Value Description
Slave address 0x01 -
Function code 0x04 Read input registers
Start address HI 0x00
Start address (00209)
= 0x00D1
Start address LO 0xD0
Quantity HI 0x00
Number of registers
= 0x0003
Quantity LO 0x03
Field Value Description
Slave address 0x01 -
Function code 0x04 Read input registers
Byte count 0x06 6 bytes follow
00209 HI 0x00
Pit alarms 1
00209 LO 0x08
00210 HI 0x00
Pit alarms 2
00210 LO 0x00
00211 HI 0x00
Pit alarms 3
00211 LO 0x00
Bit Description
0 0 (do not reset)
1 0 (do not reset alarms)
2 0 (do not reset history)
3 0 (do not reset event log)
4 0 (do not interlock the pit)
5 1 (set pit to "Auto" mode)
Field Value Description
Slave address 0x01 -
Function code 0x06 Write single register
Start address HI 0x00
ControlRegister address
= 00101 (0x0065)
Start address LO 0x64
Value HI 0x00
ControlRegister value
= 32 (0x0020)
Value LO 0x20
Field Value Description
Slave address 0x01 -
Function code 0x06 Write single register
Start address HI 0x00
ControlRegister address
= 00101 (0x0065)
Start address LO 0x64
Value HI 0x00
ControlRegister value
= 32 (0x0020)
Value LO 0x03
Writing control bits that are mutual exclusive may
lead to unpredictable results.
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