Spectrum Controls 1769sc-HART Modules User Manual
Page 162
Compact IO™ Isolated HART Analog Output Module
User’s Manual 0300217-03 Rev. A
9-2
control relay is de-energized, thereby removing power to the machine. Never alter these
circuits to defeat their function. Serious injury or machine damage could result.
Section 9.2
Module Operation
vs. Channel
Operation
The module performs diagnostic operations at both the module level and the channel
level. Module-level operations include functions such as power-up, configuration, and
communication with a 1769 bus master, such as a MicroLogix 1500 controller, 1769-
ADN DeviceNet Adapter, or CompactLogix controller.
Channel-level operations describe channel related functions, such as data conversion and
over- or under-range detection.
Internal diagnostics are performed at both levels of operation. When detected, module
error conditions are immediately indicated by the module status LED. Both module
hardware and channel configuration error conditions are reported to the controller.
Channel over-range or under-range conditions are visible in the module’s input data
table. Module hardware errors are typically reported in the controller’s I/O status file.
Refer to your controller manual for details.
Section 9.3
Power-up
Diagnostics
At module power-up, a series of internal diagnostic tests are performed. If these
diagnostic tests are not successfully completed, the module status LED remains off and a
module error is reported to the controller.
Table 9-1 (LED Status)
If m odule s tatus LED
is :
Indicate d
condition
Corre ctive a ction:
On
Proper Operation
No action required
Of f
Module Fault
Cycle power. If
condition persists,
replace the module.
Call your local
distributor or
Spectrum Controls
for assistance.
Section 9.4
Channel
Diagnostics
When an output channel is enabled, the module performs a diagnostic check to see that
the channel has been properly configured. In addition, the channel is tested on every scan
for configuration errors, over-range and under-range conditions.
9.4.1 Invalid Channel Configuration Detection
Whenever a channel configuration word is improperly defined, the module reports an
error. See Table 9-4 for a description of module errors.