BECKHOFF EtherCAT Registers Section II - Manual (Page 91)

ESC specific registers (0x0E00:0x0EFF)
Slave Controller – Register Description II-79
3.50.4 ESC20
Table 134: Register FPGA Update (0x0E00:0x0EFF)
ESC20 ET1100 ET1200 IP Core
Bit Description ECAT PDI Reset Value
FPGA Update (ESC20 and TwinCAT only)