Siemens AS-i Master CM 1243-2 a Manual page 100

Diagnostics
8.2 Diagnostics in STEP 7
STEP 7 offers several possibilities for requesting the diagnostic information of the
AS-i master:
● In the network view of the device configuration, special diagnostic symbols indicate the
status of the AS-i master and the AS-i slave. Red symbols indicate an error, green
symbols indicate the "good" status for the devices.
● The same information is also indicated in the STEP 7 project tree. This provides a quick
overview of system status, because error information is transferred to the higher-level
components in accordance with the hierarchy. "Error in subordinate component" will
therefore be indicated by the status symbol for the S7-1200 CPU when one or more AS-
i slaves report an error.
● When an AS-i master is selected, you can open the "Online & Diagnostics" view. You can
start this from the menu "Online -> Online & Diagnostics". You can call up information
here concerning the status of the AS-i master.
● The control panel of the AS-i master can also be called up in this display. This shows the
status of the LEDs.
● All the relevant events are stored in the diagnostic buffer of the S7-1200 CPU. You can
display the diagnostic buffer in the "Online & Diagnostics" window for a selected S7-
1200 CPU.
Note
Diagnostics by means of the integrated LEDs
The AS-i data decoupling unit DCM 1271 is not configured in STEP 7, so no diagnostic
information can be called up there for this unit.
The AS-i data decoupling unit DCM 1271 can be diagnosed by means of the integrated
LEDs.
Signaling of a ground fault can also be transferred to a digital input of the S7-1200 via the
terminal described in section Displays and connections of the AS-i data decoupling unit
DCM 1271 (Page 23). The status can then be evaluated there in the user program.
100
AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200
Manual, 04/2013, A5E02655230010A/RS-AA/003