Rockwell Automation Allen-Bradley 1790D-N0C2, Руководство пользователя

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Rockwell Automation Publication 1790-UM001B-EN-P - April 2021 43
Chapter 5 Module Diagnostics and Troubleshooting
Network Status
The network status indicator shows the condition of the DeviceNet
connection.
Table 33 shows network status indicator operation.
Channel Diagnostics
When an input or output module channel is enabled, the module performs a
diagnostic check to see that the channel has been properly configured. In
addition, the module checks each channel on every scan for configuration
errors, under range, open circuit (input module in 4
…
20 mA range only).
Out-of-Range Detection (Input Modules Only)
An out-of-range low test is performed on all channels that are configured for
4
…
20mA inputs. Whenever an out of range low condition occurs, the status bit
for that channel is set in input data word 4.
Open-Circuit Detection (Input Module Only)
The module performs an open-circuit test on all channels that are configured
for 4
… 20 mA inputs. Whenever an open circuit condition occurs, the status bit
for that channel is set in input data word 4.
Possible causes of an open circuit include:
• the sensing device may be broken
• a wire may be loose or cut
• the sensing device may not be installed on the configured channel
Analog Input Module Error
Definition Table
Analog input module errors are expressed on a channel basis in input read
word 4.
Figure 34 shows the structure of the status data.
Table 33 - Network Status Indicator
Status indicator Status Description
Network status
Steady red Unrecoverable communication fault
Flashing red Recoverable communication fault
Steady green Communication path complete
Flashing green Communication path incomplete
Off Device is not online or not powered
Table 34 - Input Channel Status Data
Word Bit Position
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
4 Not used S3 S2 S1 S0