Channel Operation; Power - Up Diagnostics; Section 9.4 Channel Diagnostics; Invalid Channel Configuration Detection - Spectrum Controls 1769sc-IF4IH User Manual

9-2
Compact IO™ Isolated HART Analog Input Module
Section 9.2
Module Operation
vs. Channel
Operation
Section 9.3
Power-up
Diagnostics
Section 9.4
Channel
Diagnostics
User' s Manual 0300215-03 Rev. A
These devices must be wired in series so that when any one device opens, the master
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.
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.
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 status LED Indicated
is: condition
On Proper O peration
Off Module Fault
When an input 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, and open-circuit 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.
Corrective action:
No action required
Cycle power. If
condition persists,
replace the module.
Call your local
distributor or
Spectrum Controls
for assistance.