Grundfos CIM 200 - Interlocking the Pit

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15.6 Interlocking the pit

This shows how to interlock 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 0b000000000010000 = decimal 16 =

0x0010.

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.

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 1 (interlock the pit)

5 0 (set pit in "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

= 16 (0x0010)

Value LO 0x10