Alarms from EKC controllers will also be registered by AKA 245, but if the data connection between the
EKC controllers and the gateway is interrupted, only an active alarm, if any, will be present when the
connection is reestablished. In other words, all alarms occurring during the period without data com-
munication will not be registered.
Alarm receipt
Alarms can be received in four ways:
1) The alarm is not passed on(factory setting).
The alarm is entered on the alarm list, but is not pro cessed. The DO2 alarm relay will however be
activated for two minutes on receiving a “status 1” alarm from a controller. The alarm list can be
displayed via control panel type AKA 21 or via system soft ware type AKM.
The alarm list can contain max. 250 alarm messages (the oldest ones are deleted).
System software type AKM is used for setting this function. In the alarm receipt menu for the
gateway in question, put “AKA Alarm Report To” in pos. “No ne”.
2) Alarm is passed on to the printer connected to the printer output.
The alarm is entered on the alarm list, but is also trans mitted to the printer.
DO2 is activated for two minutes when a “status 1” alarm is received from a control ler.
With the factory setting, the receiver of the alarm is the master gateway’s own system address.
(When system software type AKM is used, this system address will as regards function be identical
with setting 000:000).
3) Alarm is passed on in the system.
The alarm is transmitted to another master gateway in another network, or to the address of system
software type AKM.
DO2 is activated for two minutes when a “status 1” alarm is received from a control ler.
Use system software type AKM for setting this function. In the alarm receipt menu for the gateway
in question, put “AKA Alarm Report To” to “System address”, and defi ne the system address.
4) AKA alarm routing
The alarm is transmitted to the receivers defi ned in the alarm table. This function may for instance
be used when the gateway is mounted in a network, where a PC with AKM has not been connected.
Cf. the section “AKA Alarm Table”. (System software type AKM is used for setting this function).
Ad 2), 3) and 4):
It is a requirement that a recipient (also copy receivers) is always able to receive the message. If the
message cannot be delivered, the gateway will lock the relevant alarm line, so that the alarm can
be trans mitted at a later time. If the gateway receives further alarms, they will be entered as new
alarms. If the alarm in qu estion is then numbered “249”, no new alarms can be entered on the alarm
list. This will produce the system alarm “Alarm list overfl ow”.
In case of “Alarm list overfl ow” alarm relay DO2 will be activated every fi fth minute, until the alarms
can again be transmitted to the alarm receiver.
Example of alarm list overfl ow:
In the master gateway, the alarm receiver “AKA send alarm to” has been set to “System address”, but
no printer has been connected, or it has been turned off :
In this situation it will be able to receive the fi rst 249 alarms, and after that it will try every fi fth
minute to retransmit the oldest alarm to the printer. Alarm No. 250 will trigger the system alarm
“Alarm list overfl ow”, and from now on no more alarms can be received. If there should be more
alarms from the control lers, these alarms will be retransmitted every fi fth minute, and these
retransmissions will gradually hamper the communication in DANBUSS so much that the data
transmission is blocked. If more alarms should occur in an AKC controller than it can hold (20), these
new alarms will not be registered.
If the printer is connected at this point, it will make a printout of all alarms, and the master gateway
will again be able to receive alarms.
In this example, the selected setting “AKA send alarm to” should be “none”, rather than “System
address”.
Appendix B contains a description of repeat routines for alarm transmissions when calls are not
successful.
14
Manual RS8DT102 © Danfoss 09/2004
AKA
245
