IFM CR3020, Инструкция к добавке, Страница: 16 / 55

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ifm Programming Manual (supplement) CAN module RTC CR3020 2017-10-26
ifm function elements ifm functional elements, POUs (Basic)
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3.2.2 RTC_INITIALIZE
21847
Unit type = function block (FB)
Unit is contained in the library ifm_RTC_Basic_V01yyzz.LIB
Symbol in CODESYS:
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Description
21849
22111
This must be the first communication with the real-time clock!
RTC_INITIALIZE initialises the connection between the controller and the real-time clock.
Without this POU, no connection between the controller and the real-time clock is established.
With the COB-ID 0x7FFT, the controller sends an empty message (without data) to the bus until the
real-time clock responds.
The real-time clock recognises the CAN baud rate and responds under the COB-ID 0x7FE with its
node ID.
The controller defines the received node ID as output parameter CURRENT_ID.
The output parameter RESULT informs about the current operating status of the POU.
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Parameters of the inputs
21850
Parameter
Data type
Description
INIT BOOL TRUE (only for 1 cycle):
Function block is initialised
FALSE: during further processing of the program
CHANNEL BYTE CAN interface (1...n) depending on the device
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Parameters of the outputs
22114
Parameter
Data type
Description
CURRENT_ID BYTE Node ID in the real-time clock
RESULT BYTE feedback of the function block
(possible messages → following table)
Possible results for RESULT:
Value
dec | hex
Description
0 00 FB is inactive
1 01 FB execution completed without error
– data is valid
5 05 FB is active
– no data received yet
9 09 CAN is not active
241 F1 Error: Response does not correspond to the request
(Response

Request)
242 F2 Error: setting is not possible