Saia-Burgess Controls AG
H
ardware manual for PCD3 series │ Document 26-789 ENG19│ 2018-06-29
Diagnosis Information of the RIO
RIO (Remote Input Output) head stations
4-10
4
Status of the outputs in the event of a bus fault (command 3)
Master→RIO
Byte 0
Byte 1
Byte 2
Byte3
Value MSB
Value LSB
Module slot
3
RIO→Master
Byte 0
Byte 1
Byte 2
Byte3
Status
0
Module slot
3
Function 3 defines the preferred state of the outputs. This preferred state is
chosen when
●
the connection to the bus is interrupted
●
the master is in the STOP/PAUSE state
The status is 0 if the selection was accepted, otherwise it contains 0xFF.
The coding of the module space field is the following:
Bit
Meaning
0…3
Module space (0…15)
4…6
Channel number (0…7) For analog outputs, this is the analogue
channel number
7
When set to (continue), the last status of the outputs is retained.
In which case bytes 0 and 1 are irrelevant.
Example: Module position = 0x82 → The outputs (if 16 digital outputs, then
the 8 LSBs) of module position 2 (3rd place) are retained.
In the event of a bus error or in STOP mode, the default switch-off
status sets all outputs to 0.
For analog outputs, this does not mean that the value of all outputs is 0.
