Siemens SIMATIC User Manual

Digital modules
3.24 Digital output module SM 322; DO 16 x DC 24 V/0.5 A: (6ES7322-8BH10-0AB0)
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ
153
3.24.2 Diagnosis of digital output modules
Introduction
General information in regards to the evaluation of the diagnosis messages can be found in
the chapter Diagnosis of digital modules (Page 59) and the design and content of the
individual bytes in the chapter Diagnosis data from the SM 322; DO 16 x DC24 V/0.5 A
(6ES7322-8BH10-0AB0) (Page 590).
Channel errors are signaled with the channel error display (red LED per channel) and
reported in the data record 1. As soon as at least one channel error display is lit, the group
error display (SF) is also lit.
Module errors are signaled via the diagnostic data record 0/1 and only displayed via the the
group error display (SF).
Group diagnostics
Through the "Group diagnositcs" setting, the message from the channel-specific fields, with
the exception of "external load voltage L+", for "Setting error" and the recognition of a
discrepancy error can be turned off.
Load voltage L+ missing
The approval of the channel diagnositcs "external load point L+" occurs in channel groups
through the diagnostics setting "Missing load voltage L+". This means that if the load voltage
fails, the error will be reported to all four channels of a channel group. Additionally, the
module-specific message occurs in the byte 0 of the diagnostics dataset 0 / 1, "external
auxiliary voltage missing". Even if the diagnostics of "Missing load voltage L+" is turned off
for all channels/channel groups, the recognition within the module remains active. This
means that if there is a failure of at least one load voltage, the module error will always be
reported in the byte 0 of the diagnostics data set 0 / 1 "External auxiliary voltage missing".
Fuse blown
If a fuse is blown, it will always be reported to all four channels of a channel group. In
addition to the channel message, there is always the module-specific message in the byte 3
of the diagnostics dataset 0 / 1 "Fuse defect". Even if the "Group diagnostics" setting is
disabled by all channels, a defective fuse will always be reported as module error in the byte
3 of the diagnostics dataset 0 / 1 "Fuse defect".

Siemens SIMATIC Specifications

General

Brand	Siemens
Model	SIMATIC
Category	Control Unit
Language	English