Function Block: "Faults; Purpose And Activation; Fault Priorities And Acknowledgement; Universal Fault Inputs - Siemens RMB795B Basic Documentation

Purpose
Activation
Fault priorities
Fault acknowledgement
Connections
Configuration
Settings
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Building Technologies
10

Function block: "faults"

10.1

Purpose and activation

Function block "Faults" collects all fault status messages, evaluates them and
responds to protect building and plant.
Faults
To activate the function block, 1 of the inputs Aux1...Aux10 must be configured.
Many faults are acquired automatically and need not be specifically configured in
function block "Faults". These faults are described with the relevant function.
Example: "Fire alarm off".
10.2

Fault priorities and acknowledgement

The RMB795B central control unit differentiates between 2 fault priorities:
Urgent These are fault status messages that represent plant risks, or
where reliable operation of plant can no longer be ensured
(e.g. "Smoke extraction").
Not urgent. These are fault messages that represent no direct risk to plant
operation (e.g. "Outside temp sensor error").
The RMB795B central control unit differentiates between 3 types of fault
acknowledgement:
None/acknowledge/acknowledge and reset.
For details, see Sec. 17.2.2 "Alarm acknowledgement".
10.3

Universal fault inputs

Using function block "Faults", the RMS795B has 10 universal fault inputs at its
disposal. Any type of analog or digital signal can be fed to these inputs.
To activate a fault input, an Xx input of the central control unit or of an extension
module must be assigned to it.
Main menu > Commissioning > Extra configuration > Faults
Operating line
Fault input 1
...
Fault input 10
The following settings are possible for each fault message:
• Fault status signal delay. Elapsed time until a pending fault generates a fault
message.
• Alarm acknowledgement
• Fault priority
Central control unit RMB795B
Function block: "faults"
Adjustable values / remarks
---, N.X1, N.X2, ...
---, N.X1, N.X2, ...
CE1P3122en
18.01.2012