G3
Series
PROFIBUS
‐
DP
Technical
Manual
Page
51
TDG3PTTM1-2EN
02/09
Subject to change without notice
www.numatics.com/g3
Communication Fault/Idle Mode Parameter
This parameter is used to set the behaviors of output points (bits) during a communication fault or an “idle”
event (when a PLC is “Idle mode” not in RUN mode). The parameter shown below is used to determine what
state the outputs will have during an “Idle” event and a “Fault” event. It will allow control of all output points,
valves and discrete I/O, on the manifold.
The user, through the graphic display or software, can determine how the outputs behave when a
communication fault or idle actions occurs. These settings are non-volatile and thus will not change upon loss
of power.
The two behavior options are:
1.
Hold Last State of Outputs
2.
Turn Off All Outputs
Communication Fault/Idle Mode Sequence
The Communication Fault/Idle Mode parameter determines the output state if the device encounters a
communication fault and/or idle action. A Communication Fault is defined as an inability for the master node
to communicate with a slave node on a network. Idle Mode is a condition when the processor is in program
mode.
The process for determining the output state during a Communication Fault/Idle Mode is as follows:
1.
The device receives a Communication Fault/Idle Mode event.
2.
The device determines what action to take based on the Communication Fault/Idle Mode attribute
setting.
3.
If the attribute is set to turn off all outputs, all of the outputs will turn off (Factory Default Setting).
4.
If the attribute is set to hold last state, all of the outputs will hold their last state.
Communication
Fault Received
Device
Checks
Communication
Fault
Attribute
Hold Last State
Turn OFF
All Outputs
Outputs
De-Energize
Outputs
Do Not
Change State