BECKHOFF ET1100 - Manual (Page 63)

PDI description
Slave Controller – ET1100 Hardware Description III-49
6.2 Digital I/O Interface
6.2.1 Interface
The Digital I/O PDI is selected with PDI type 0x04. The signals of the Digital I/O interface are:
ET1100
I/O[31:0]
LATCH_IN
OUTVALID
SOF
OE_EXT
OE_CONF
WD_TRIG
EEPROM_LOADED
Figure 9: ET1100 Digital I/O signals
Table 54: ET1100 Digital I/O signals
Signal Direction Description
Signal
polarity
I/O[31:0] IN/OUT/BIDIR Input/Output or Bidirectional data
LATCH_IN IN External data latch signal act. high
OUTVALID OUT Output data is valid/Output event act. high
SOF OUT Start of Frame act. high
OE_EXT IN Output Enable act. high
OE_CONF IN Output Enable Configuration
WD_TRIG OUT Watchdog Trigger act. high
EEPROM_LOADED OUT PDI is active, EEPROM is loaded act. high
6.2.2 Configuration
The Digital I/O interface is selected with PDI type 0x04 in the PDI control register 0x0140. It supports
different configurations, which are located in registers 0x0150
– 0x0153.