Functions
5.2 Intelligent IO devices (I-devices)
PROFINET with STEP 7
Function Manual, 05/2021, A5E03444486-AL
147
Requirements
You operate the CPU as an I-device on one or multiple IO controllers or you have configured
the CPU as I-device ("IO device" check box is selected). In the following figure, the right
CPU 1518-4 PN/DP is the I-device at the higher-level IO controller CPU 1518-4 PN/DP (PLC_2).
Figure 5-22 Example: Enable I-device
"D_ACT_DP" is an asynchronous instruction. Processing extends over multiple calls. You have
started the job by calling "D_ACT_DP" with REQ = 1 in the startup OB of the I-device CPU.
You can find additional information on the "D_ACT_DP" instruction in the STEP 7 online help.
Disabling the I-device function at a PROFINET interface
Note
Only disable the I-device function in the I-device CPU when the I-device is not operated on a
higher-level IO controller.
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