IL17574C
Page 5-6
Effective Date: 2/04
IQ 300
Page 5-6
Effective Date: 2/04
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1's Complement of
Slave Action Byte1
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Register 425091 (6202
16
)
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Register 425089 (6200
16
)
Register 425090 (6201
16
)
Slave Action Byte0
Slave Action Byte1
1's Complement of Slave Action Byte2
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Slave Action Byte2
1's Complement of Slave Action Byte0
Figure 5.2 Control Product Data Format
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.