Transmission Error Processing; B7A Interface Input Ports; B7A Interface Output Ports; Transmission Error Input Status Processing - Omron NJ501-1 Series User Manual

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Transmission Error Processing

B7A Interface 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 transmission errors occur at B7A interface input ports, the ERR1 to ERR4 indicators on the
front panel will turn ON according to the port where the error occurred.
Port where error
occurred
Port 1
Port 2
Port 3
Port 4
 Transmission Error Notification Variables
The following bits in the Basic I/O Unit Information system-defined variables that are allocated to the
I/O ports of the Units will change to TRUE when a transmission error occurs.
Example: Rack 0, Slot 0
B7A interface port
Port 1
Port 2
Port 3
Port 4
Example: Rack 0, Slot 1
B7A interface port
Port 1
Port 2
Port 3
Port 4
 Transmission Error Input Status Processing
If a transmission error occurs at an input port, the status of the input bit in the CPU Unit variable
from immediately before the transmission error is held. When transmission returns to normal, the
signals that have been normally received will be input to the input bit.

B7A Interface Output Ports

The B7A Interface Unit does not detect transmission errors at output ports. Detect output port transmis-
sion errors at the B7A Link Terminal that is connected to the B7A Interface Unit.
NJ-series CPU Unit Hardware User's Manual (W500)
LED error indicators
CJ1W-B7A14 CJ1W-B7A04
ERR1 ---
ERR2 ---
ERR3 ---
ERR4 ---
CJ1W-B7A14
_CJB_IOUnitInfo[0, 0, 0]
_CJB_IOUnitInfo[0, 0, 1]
_CJB_IOUnitInfo[0, 0, 2]
_CJB_IOUnitInfo[0, 0, 3]
CJ1W-B7A14
_CJB_IOUnitInfo[0, 1, 0]
_CJB_IOUnitInfo[0, 1, 1]
_CJB_IOUnitInfo[0, 1, 2]
_CJB_IOUnitInfo[0, 1, 3]
3 Configuration Units
CJ1W-B7A22
---
---
ERR1
ERR2
CJ1W-B7A04 CJ1W-B7A22
--- ---
--- ---
--- _CJB_IOUnitInfo[0, 0, 0]
--- _CJB_IOUnitInfo[0, 0, 1]
CJ1W-B7A04 CJ1W-B7A22
--- ---
--- ---
--- _CJB_IOUnitInfo[0, 0, 0]
--- _CJB_IOUnitInfo[0, 0, 1]
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