Output Behavior on the TSX ASY 800 Module
(Original Document)
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Fallback/Maintenance or Resetting Outputs to 0 (Zero)
In case of error, and depending on its criticality, outputs switch individually or simultaneously to the Fallback/Maintenance position, or else are forced to 0 (0 V or 0 mA).
Various output behaviors:
Error
Behavior of Voltage Outputs
Behavior of Current Outputs
Task in STOP mode, or program missing
Fallback/Maintenance
(channel per channel)
Fallback/Maintenance
(channel per channel)
Communication Error
Configuration Error
0 V (channel per channel)
0 mA (channel per channel)
Internal Error in Module
Output Value out-of-range (range under/overflow)
Value transmitted with saturation at +/- 10.5 V
(channel per channel)
Value transmitted with saturation at 3.2/20.8 mA or 0/20 mA
Terminal block fault
Maintenance at value
(all channels)
Maintenance at value
(all channels)
Pin connection under voltage (processor in STOP mode)
0 V (all channels)
0 mA (all channels)
Reloading Program
Fallback or maintenance to the current value is selected during the module configuration. The fallback value may be modified from the Debug screen in Control Expert or through a program.
Behavior at Power-Up
When power is first provided to the module (when rack is powered-up or during pin connection under voltage), all outputs are frozen at 0 V/0 mA for one second, before they become functional.
This delay is required in order to stabilize the power supply to the outputs.