5 Operating the Application Examples
Default settings to operate the application example
Starting from the factory settings of the interface parameter settings,
Table 5-1
D100
D149
D14A
the following default settings of the holding registers have to be made for the
application example to run smoothly:
When operating several fans, make sure that only one fan with Modbus address 1
can be reached by the S7-1200 at once. For fan 1, change its Modbus address to
an address that is entered as a start value "Register".fan[x].mbAddr of another fan.
After "Reset" = "Param." for confirming the address change, the fan will be reached
under the number x. Now expand the bus with the next fan with default settings
and repeat the procedure until all fans can be reached.
Table 5-2
D101
D104
D148
All 3 parameter defaults are written to the fan's EEPROM. To be applied, the
values have to be copied into the RAM. This is accomplished by executing (write)
the "Param." function in the "Reset" (D000) holding register.
You can restore the factory settings using the "Control default setting" (D005)
Note
holding register by executing the function "W -> D".
For this purpose, you need a 12-digit hexadecimal password which you have to
write into the "Password" (D002) holding register first.
This password is available from ebm-papst.
5.2.3
Status evaluation
At the bottom edge of the display, you see a status display of the data exchange
with the fans.
Figure 5-5
During error-free operation, the status is marked with hexadecimal code 16#0000
("No error").
When communication errors with the respective fan occur, the error code in
connection with the plain text output provides information about the error that has
occurred.
The following table lists the most frequent errors:
Controlling several fans (ebm-papst) via Modbus RTU
Entry ID: 109476801,
V2.0,
Address
Fan address
Transfer rate
Parity configuration
Address
Set value source
Source parameter set
Source running direction
09/2018
Designation
1
19200 bit/sec
8E1
Designation
RS485
Internal parameter set
Preferred running direction
Value
Value
41
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