User Manual

Compact IO™ Isolated HART Analog Output Module
User’s Manual 03 00217-03 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 oper ations include functions such as power-up, configuration, and
communicat i on wi t h a 1769 bus master, such as a MicroLogix 1500 cont roller, 1769-
ADN DeviceNet Adapter, or CompactLogix controller.
Channel-level operations desc ri be cha nnel r e l at ed funct i o n s, such as data con ve rsi o n 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 module status LED
is:
Indicated
condition
Corrective action:
On Proper Operation
No ac t ion required
Off Module Fault
Cy c le power. If
c ondit ion pers is ts ,
replac e t he m odule.
Call y our loc al
dis tributor or
S pec trum Controls
for as s is tanc e.
Section 9.4
Channel
Diagnostics
When an output channe l 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.