Extended Communications Via Modbus - Eaton Cutler-Hammer IQ 300 Series Instructions For Installation, Operation And Maintenance

IL17574C
Page 5-6
5.6

EXTENDED COMMUNICATIONS VIA MODBUS

Since a control error could result in unwanted actions initiated by MODBUS the IQ
300 requires a specific protocol by the MODBUS Master in order to perform control
related functions within the IQ 300
A set of registers is reserved for the control protocol. They begin at register 6200
hex and extend through 6203 hex. These three registers are written with a 'slave
action number' and it's 1's complement, using function code 10 hex. The format of
the data is shown in figure 5.2. These three registers, and only these three registers,
must be written in one MODBUS transaction.
If the 'slave action number' is valid and not blocked by a LOCKED system , the IQ
300 issues the 'slave action' control command.
15 14 13 12 11 10
15 14 13 12 11 10
15 14 13 12 11 10
Figure 5.2 Control Product Data Format
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Effective Date: 2/04
Register 425089 (6200
9 8 7
Slave Action Byte1
Register 425090 (6201
9 8 7
1's Complement of Slave Action Byte0
Register 425091 (6202
9 8 7
1's Complement of Slave Action Byte2
IQ 300
)
16
6 5 4 3 2 1 0
Slave Action Byte0
)
16
6 5 4 3 2 1 0
Slave Action Byte2
)
16
6 5 4 3 2 1 0
1's Complement of
Slave Action Byte1
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Effective Date: 2/04