3 Mode of Operation
Name
P type
lastFan
IN_OUT
read
IN_OUT
write
IN_OUT
cyclic
IN_OUT
acyclic
IN_OUT
manual
IN_OUT
hmi
IN_OUT
fan
IN_OUT
The FB "EbmPapst" includes the calls of the system blocks "Modbus_Comm_Load"
and "Modbus_Master".
The "Modbus_Master" only allows blocks to be handed to the parameter
"DATA_PTR" in which the attribute property "optimized block access" is not
enabled. No block of this application example (FB or DB) has the property
"optimized block access". This prevents cycle time increases due to recopying
optimized DBs in non-optimized DBs.
Note
For a more detailed description of the communication instructions
"Modbus_Comm_Load" and "Modbus_Master", see the STEP 7 V15 online help
or the chapter
The FB "EbmPapst" reads the most important input registers of the fans in cyclic
intervals of approximately 400 ms per fan. Additionally, you can retrieve and write
to predefined holding registers of a fan with the configured HMI and to write a
command to one or several fans (see chapter 3.2).
The FC "ReadWrite" enables you to access further registers in the control program
part (see chapter 3.5).
Controlling several fans (ebm-papst) via Modbus RTU
Entry ID: 109476801,
V2.0,
Data type
USInt
Last fan to be addressed
(is limited by the FB: 1 ≤ lastFan ≤ FAN_MAX)
"typeRead"
PLC data type to read a register
"typeWrite"
PLC data type to write holding registers
"typeCyclic"
PLC data type with the order of the data to be
exchanged cyclically
"typeCyclic"
PLC data type with the order of the data to be
exchanged acyclically
"typeManual"
PLC data type to exchange data with the FC
"ReadWrite"
"typeHMI"
PLC data type with display information for the HMI
Array[0.."FAN_MAX"]
Array with the data of the individual fans
of
"typeFan"
(1 to user constant "FAN_MAX";
0 = multiplex placeholder for the HMI display "Fan
view")
"Modbus RTU"
in the S7-1200 system manual (\8\).
09/2018
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