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AnteSavilt · Member 2 Joined: 13 Feb 2018 Posts: 264 Location: Croatia

Reading out Alarms with the "Get_Alarm" instruction in S7-1500 CPU
https://support.industry.siemens.com/cs/document/109748168/reading-out-alarms-with-the-get_alarm-instruction-in-s7-1500-cpu
Alarms allow the machinery operator and maintenance personnel to quickly detect process errors in the automation system, to localize them precisely, and to eliminate them. Using the "Get_Alarm" instruction, you can read out alarms in the user program via the alarm interface of the S7-1500 CPU.
https://support.industry.siemens.com/cs/#chapter_5436227_0
https://support.industry.siemens.com/cs/#chapter_5436227_2
Getting Started instruction "Get_Alarm"
With the instruction "Get_Alarm" you can read out messages in the user program via the alarm interface of the S7-1500 CPU. The instruction "Get_Alarm" logs on to the message system interface of the S7-1500 CPU like a SIMATIC HMI in order to read out an incoming or outgoing message.

Requirements
SIMATIC STEP 7 (TIA Portal) from V14
SIMATIC S7-1500 CPU as of Firmware V2.0
Downloads
https://support.industry.siemens.com/cs/attachments/109748168/109748168_GettingStarted_Get_Alarm_DOC_V23_en.pdf
https://support.industry.siemens.com/cs/attachments/109748168/109748168_Get_Alarm_GettingStarted_V21.zip
Reading out Alarms with the "Get_Alarm" instruction in S7-1500 CPU and sending them to an Alarm System

The incoming and outgoing alarms of the S7-1500 PLC_1 are read out and acquired and saved in a "alarmStorage" data block in PLC_1. Afterwards you can send these alarms from PLC_1 with the "TSEND_C" instruction as string to PLC_2. The alarms are received on the PLC_2 with the "TRCV_C" instruction and stored in a "rcvdStorage" data block. The alarms received via "Get_Alarm" can be read out via OPCUA client.

The following figure shows, how S7-1500 PLC alarms are received using the "Get_Alarm" instruction and sent to a S7-1500 PLC_2.
"Get_Alarm" instruction in S7-1500 CPU "Get_Alarm" instruction in S7-1500 CPU

"Get_Alarm" instruction in S7-1500 CPU "Get_Alarm" instruction in S7-1500 CPU

This application example describes the following aspects:
Receiving pending alarms in PLC_1 using "Get_Alarm" and sending it to PLC_2.
Reading out alarms
Acknowledging received alarms
https://support.industry.siemens.com/cs/attachments/109748168/109748168_Grundlagen_Get_Alarm_DOC_V10_en.pdf
https://support.industry.siemens.com/cs/attachments/109748168/109748168_Get_Alarm_DOC_V10_en.pdf
https://support.industry.siemens.com/cs/attachments/109748168/109748168_Get_Alarm_TIAV14SP1_CODE_V10.zip
STEP 7 TIA V15
https://support.industry.siemens.com/cs/attachments/109748168/109748168_Get_Alarm_TIAV15_CODE_V10.zip