Siemens Climatix S300 HRV - Page 162

For analog output / value objects, MODBUS Master is expected to send one of the
following MODBUS write requests, all three options are accepted:
● WriteMultipleReg.req (FC=16, StartAddr, QuantityOfReg=4, ByteCount=8,
data=(2Registers with 32bit real value; 1Register with Cmd and Priority field;
1Register with void value))
● WriteMultipleReg.req (FC=16, StartAddr, QuantityOfReg=3, ByteCount=6,
data=(2Registers with 32bit real value; 1Register with Cmd and Priority field))
● WriteMultipleReg.req (FC=16, StartAddr, QuantityOfReg=2, ByteCount=4,
data=(2Registers with 32bit real value)).
In this case, Default-Priority13 is used
Example of a binary/multistate
input
object (extended read):
Input register address Data item structure
X Present value
X+1 Status flags Voidfield(=0:0)
X+2 Reliability
Example of a binary/mutistate
output
object (extended read/write):
Holding register address Data item structure
X Present value
X+1 Status Flags Cmd(=Ready) Priority
X+2 Reliability
Register
Address
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
x
Present value
x+1 r(0) r(0) r(0) r(0)
Status flags Cmd Priority
x+2
Reliability
Data item structure for 16bit data and Mapping=Extended
For binary and multistate output and value objects, the MODBUS Master is
expected to send one of the following MODBUS write requests, all four options are
accepted:
● WriteMultipleReg.req (FC=16, StartAddr, QuantityOfReg=3, ByteCount=6,
data=(1Register with 16bit multistate value; 1Register with Cmd and Priority
field; 1Register with void value))
● WriteMultipleReg.req (FC=16, StartAddr, QuantityOfReg=2, ByteCount=4,
data=(1Register with 16bit multistate value; 1Register with Cmd and Priority
field))
● WriteMultipleReg.req (FC=16, StartAddr, QuantityOfReg=1, ByteCount=2,
data=(1Register with 16bit multistate value)).
In this case, Default-Priority13 is used.
● WriteSingleReg.req (FC=06, StartAddr, 16bit multistate value).
In this case, Default-Priority 13is used.
Engineering of communicative devices
Modbus slave
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