Siemens bt300 - Modbus RTU (M5.8.3)

Chapter 4 - Parameters and Menu Structure
I/O and Hardware (M5)
136 | 180
Siemens Industry, Inc.
Siemens BT300 HVAC Drive
DPD01809
Building Technologies
2016-06-07
1. Complete all settings required for Monitoring as listed above.
2. Set Control Place Auto (P1.15 or P3.2.1) to a value of FieldbusCTRL.
To command Start/Stop through the P1 protocol, and Speed Reference through an Analog Input, complete the
following steps:
1. Complete all settings required for Monitoring as listed above.
2. Set Ctrl. Place Auto (P3.2.1) to a value of FieldbusCTRL.
3. Set FieldbusCtrl Ref (P3.3.9) to a value of AI1 or AI2 (depending upon which AI is in use).
To command Start/Stop through a Digital Input, and Speed Reference through the P1 protocol, complete the
following steps:
1. Complete all settings required for Monitoring as listed above.
2. Set Ctrl. Place Auto (P3.2.1) to a value of I/O Control.
3. Set I/O A Ctrl Ref (P3.3.3) to a value of Fieldbus.
Modbus RTU (M5.8.3)
Modbus RS-485 Parameters and Monitoring Values
Table 106: Parameters Related with Modbus Used through RTU.
Structure
Parameter
Unit
Min
Max
Default
ID
Description
Parameters
P5.8.3.1.1
Slave Address
1
247
1
2320
Defines the Modbus RTU unique
device address.
P5.8.3.1.2
Baud Rate
bps
300
230400
6
2378
Defines the communication speed
of the Modbus RTU network.
1 = 300
2 = 600
3 = 1200
4 = 2400
5 = 4800
6 = 9600
7 = 19200
8 = 38400
9 = 57600
10 = 76800
11 = 115200
12 = 230400
P5.8.3.1.3
Parity Type
None
Even
None
2379
Defines the parity type of the
Modbus RTU network:
0 = None
1 = Odd
2 = Even
P5.8.3.1.4
Stopbits
1 Sb
2 Sb
2 Sb
2380
Defines the stop bits of the Modbus
RTU network:
1 = 1 Stop bit
2 = 1.5 Stop bits
3 = 2 Stop bits