Beckhoff EL3182 Documentation page 114

Commissioning
Fig. 114: Selective PDO selection
Explanatory notes regarding Selective PDO selection: In the "Process Data" tab, it can be seen under (A)
that this EL3102 offers several different PDOs for the transmission, and in fact for each channel
• "Legacy" from CoE index 0x1A00/0x1A01: status word and measured value for channel, 3 bytes
• "Legacy compact" from CoE index 0x1A10: only measured value for 2 channels, 4 bytes
• "AI standard" from CoE index 0x1A02/0x1A04: measured value for channel and status, 4 bytes
• "AI Compact" under CoE index 0x1A03/0x1A05: only measured value for channel, 2 bytes
Legacy PDO Assignment
The legacy PDO Assignment is a compatibility mode for previous 2-channel 16-bit input terminals
(EL31x2) and should not be used for new configurations. This mode ensures complication-free re-
placement of older EL31x2 models with new ones. See also the following chapter.
By selecting the necessary Input SyncManager in (B), the PDO assignment under (C) can be carried out
manually. The process data can then be linked in the TwinCAT tree (D).
Note about the 1-byte status of earlier EtherCAT terminals
Previous analog input terminals from Beckhoff (e.g. EL31x2) had a status byte instead of the status word
that is now implemented and therefore a 3-byte interface. 8 additional bits now offer extended diagnostic
options, wherein the default process image of the EL31xx now encompasses 4 bytes, status word and value
word. The bit meanings of the LowByte are retained; Limit1 and Limit2 as 2-bit types are shown in the case
of the EL31xx.
114 Version: 1.2 EL3182