EM-RES-03 10/0722
5.8.3 Emergency message, reaction
If a slave on the system bus suffers a fault, it transmits the emergency telegram. The
emergency telegram marks the node ID for the identification of the failed node via its
identifier and the existing fault message via its data contents (8 bytes).
After a fault has been acknowledged on the slave, the latter again transmits an emer-
gency telegram with the data content zero.
The emergency telegram has the identifier 128 + node ID ( = 129 ... 191)
The system bus master evaluates the emergency telegrams of the slaves. Its reaction
to an emergency telegram can be set with
Emergency Reaction 989.
Operation mode Function
0 - Error The system bus master receives the emergency
telegram and switches-off
1 - No Error Das Emergency Telegram is displayed as a warn-
ing
Operation mode - parameter 989 = 0 – Error
Behavior of the system bus master in
Emergency Reaction 989 = 0 / Error:
As soon as the system bus master receives an emergency telegram, it also switches
to failure mode and reports the failed subscriber on the basis of its ID via the kind of
error. Only the subscriber is reported, not the cause of the error.
The fault message on the system bus master via
Current error 260 is 21nn with nn
= node ID (hexadecimal) of the slave in which a fault switch-off exists.
In addition, the system bus master reports the warning Sysbus (0x2000) via the pa-
rameter
Warnings 270 Bit 13.
If a fault switch-off occurs on a number of slaves, the first slave to transmit its emer-
gency telegram is displayed on the system bus master.
Operation mode - parameter 989 = 1 – No Error
Behavior of system bus master in the case of
Emergency Reaction 989 = 1 / No
Error:
As soon as the system bus master receives an emergency telegram, it reports the
warning Sysbus (0x2000) via the parameter
Warnings 270 Bit 13.
Note: In both cases, the Boolean variable SysbusEmergency with source num-
ber 730 is set to TRUE in the system bus master. It can be used in the
system bus master and (in transmission via a TxPDO) in the slaves for a
defined shutdown.
SysbusEmergency is also set if the system bus master breaks down.
Resetting of SysbusEmergency is done with the fault acknowledgment.
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