Spectrum 1762sc-OF8, Руководство пользователя

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Chapter 1: Module Overview 1-3
User’s Manual Pub. 0300246-01 Rev. C
1.4.1 LED Indicator
The 1762 output module uses a single green LED to show operational status of
the module. The LED will illuminate solid when the PLC is in run mode and the
module properly configured. If the module is not properly configured, or if the
PLC is not in run mode, the LED will blink rapidly. The following blink codes
are the only exception:
Table 1-1 (LED Blink Codes)
Blink Code Description
Rapid Blink
1
PLC not in run mode, or no valid module configuration present
Solid Module is in run mode (Normal Operation)
3 Factory calibration in progress
4 Factory calibration invalid
5 Module is in command mode
Section 1.5
System
Overview
The module communicates to the controller through the bus interface. The
module also receives 5 VDC and 24 VDC power through the bus interface.
1.5.1 Module Power-up
At power-up, the module performs a check of its internal circuits, memory, and
basic functions. During this time, the module status LED remains off. If no
faults are found during power-up diagnostics, the module status LED blinks
rapidly waiting for command mode.
After power-up checks are complete, the module waits for command mode and
then valid channel configuration data. If an invalid configuration is detected, the
module generates a configuration error and remains in command mode. Once the
module is properly configured and enabled, it continuously converts the output
command value to a proportional analog output signal.
Each time a channel command value is read by the output module, that data value
is tested by the module for an over-range or under-range condition. If such a
condition is detected, a unique bit is set in the channel status word. The channel
status word is described in section 0 Input Data File.
Using the module image table, the controller reads the two’s complement binary
converted input data from the module. This typically occurs at the end of the
program scan or when commanded by the control program. If the controller and
the module determine that the data transfer has been made without error, the data
is used in the control program.
1
All outputs are disabled until the PLC goes into run mode, and the module receives a valid configuration.