Commissioning Modbus Rtu - Siemens Acvatix SAS Series Basic Documentation

Voltage at Y1
Voltage at Y2
No voltage at Y1 and Y2
Only SAS31.50, SAS31.53,
SAS81.33, SAS81.33U,
SAT31.51
No voltage at G and G0
1)
(fail safe function)
Note
Auxiliary switch
ASC10.51
Siemens
Smart Infrastructure
Actuator's stem extends
Actuator's stem retracts
Actuator's stem maintains the position
Actuator's stem retracts (until end position is
reached)
1)
Closing action is always completed first, also when power returns.
Observe information given in chapter 4.2.1 Positioning signal and flow
characteristic selection, page 31.
Make the function check of the mounted auxiliary switch with a point test according
to the following table – example switching point at 25% position:
Connection terminals
Voltage at Y2
Y = 0 V
No voltage at Y1
Y = 0 V
und Y2
Voltage at Y1 for
desired valve
Valve
position % + 2% x
position
positioning time
% + 2%
Example:
Y = 2.7 V
SAS31.00 = 27 % x
120 sec = 32.5 sec
Check switching point with
voltmeter
3.2.2

Commissioning Modbus RTU

The devices were developed specifically for use with Climatix push-button
configuration as described in document CE1A3975
As an alternative, the bus can be configured via the local HMI; see Section User
interface, pg. 24.
Check the following during commissioning:
· Bus configuration (address, baud rate, type of transmission and optional
termination). Standard address 255 allows for installation and
commissioning of several actuators simultaneously without mutual
interference.
· The actuator parameters (direction for opening, position limits, position
adjustment etc.) can be read via the Modbus register.
1)
Documents can be downloaded at
Full or partial configuration via bus
The actuators can be configured via bus connection if the settings prior to
commissioning allow for a connection to the Modbus master/programming tool (no
address conflicts and correct baud rates/transmission format settings).
· Full configuration via bus: With a unique Modbus address, a connection can
be established from Modbus master/programming tool following startup by
means of the preset transmission format and baud rate (or auto-baud).
· Partial configuration via bus: If the Modbus address is not unique, it must
first be set to a unique value, either by using the address input with push
button (cf. page 25) or by setting the address to 246 with push button press
Actuators SAS.., SAT.. for valves
Handling
AàAB
Opening
Closing
Maintains the position
Closing
Stroke actuator
Actuator's stem retracts (until
end position is reached)
Actuator's stem maintains
the position
Actuator's stem extends to
desired position (27%)
Actuator's stem maintains
the position
1)
http://www.siemens.com/bt/download
B à AB
Closing
Opening
Opening
Terminal Terminal
S1 – S3 S1 – S2
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CE1P4041en
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