Transmission Error Processing - Omron CJ - 09-2009 Operation Manual

B7A Interface Unit
3-7-7

Transmission Error Processing

Input Ports
Indicators
Transmission Error Flag
Transmission Error Input Status Processing
Output Ports
200
The B7A Interface Unit detects transmission errors at the input ports. When a
transmission error is detected at an input port, the corresponding indicator
and Transmission Error Flag turn ON.
When a transmission occurs at an input port, indicators ERR1 to ERR4 on the
front panel will turn ON according to the port where the error occurred.
Port where
error
CJ1W-B7A14
occurred
Port 1 ERR1
Port 2 ERR2
Port 3 ERR3
Port 4 ERR4
The corresponding Transmission Error Flag in the first word allocated to the
Unit in the CPU Unit's Auxiliary Area will turn ON for each input port, as
shown in the following table. Words A050 to A080 are allocated to Basic I/O
Unit as information words.
Example: Rack 0, Slot 0
Port where
error
CJ1W-B7A14
occurred
Port 1 A05000
Port 2 A05001
Port 3 A05002
Port 4 A05003
Example: Rack 0, Slot 1
Port where
error
CJ1W-B7A14
occurred
Port 1 A05008
Port 2 A05009
Port 3 A05010
Port 4 A05011
If an error occurs at an input port, the Unit will hold the status of the input bit in
the CPU Unit's I/O memory from immediately before the transmission error
occurred. When transmission returns to normal, the signals that have been
normally received will be input to the input bit.
The B7A Interface Unit does not detect transmission errors at output ports.
Detect output port transmission errors at the B7A Link Terminal that is con-
nected to the B7A Interface Unit.
LED error indicators
CJ1W-B7A04
--- ---
--- ---
--- ERR1
--- ERR2
Transmission Error Flag
CJ1W-B7A04
--- ---
--- ---
--- A05000
--- A05001
Transmission Error Flag
CJ1W-B7A04
--- ---
--- ---
--- A05008
--- A05009
Section 3-7
CJ1W-B7A22
CJ1W-B7A22
CJ1W-B7A22