Spectrum Controls 1769sc-IT6I - Manual (Page 48)

5-2 Compact™ IO Isolated Thermocouple Module
User’s Manual Pub. 0300244-01 Rev. A
Circuits installed on the machine for safety reasons, like over-travel limit switches, stop
push buttons, and interlocks, should always be hard-wired to the master control relay.
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.
Section 5.2
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 and open-circuit conditions are reported 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 5.3
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.
If module
status LED
is: Indicated
condition: Corrective action:
On Proper
Operation
No action required
Off Module Fault Cycle power. If condition persists, replace the
module. Call your local distributor or Rockwell
Automation for assistance.
Section 5.4
Channel
Diagnostics
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.
5.4.1 Invalid Channel Configuration Detection