Omron CJ1M-CPU series User Manual

186
B7A Interface Unit Section 3-7
3-7-7 Transmission Error Processing
Input Ports
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.
Indicators
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.
Transmission Error Flag
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
Example: Rack 0, Slot 1
Transmission Error Input Status Processing
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.
Output Ports
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.
Port where
error
occurred
LED error indicators
CJ1W-B7A14 CJ1W-B7A04 CJ1W-B7A22
Port 1 ERR1 --- ---
Port 2 ERR2 --- ---
Port 3 ERR3 --- ERR1
Port 4 ERR4 --- ERR2
Port where
error
occurred
Transmission Error Flag
CJ1W-B7A14 CJ1W-B7A04 CJ1W-B7A22
Port 1 A05000 --- ---
Port 2 A05001 --- ---
Port 3 A05002 --- A05000
Port 4 A05003 --- A05001
Port where
error
occurred
Transmission Error Flag
CJ1W-B7A14 CJ1W-B7A04 CJ1W-B7A22
Port 1 A05008 --- ---
Port 2 A05009 --- ---
Port 3 A05010 --- A05008
Port 4 A05011 --- A05009

Omron CJ1M-CPU series Specifications

General

Brand	Omron
Model	CJ1M-CPU series
Category	Controller
Language	English