Siemens SINEC L2 User Manual

Start-Up, Tests, and Diagnostics S5-95U, SINEC L2
3.4.9 Reading Out the Event Message (MAC_EVENT)
This FMA service is for reading out fault events. It is useful for testing during start-up.
Principle of Operation (represented in Figure 3-16)
• Errors recognized by the communications processor (e.g., double token, frame errors) are
indicated automatically. There is no need for a service request.
• A pending error indication is displayed in the status byte (STB) at job number A-NR 200.
• An error indication is fetched by means of integral FB L2-RECEIVE (FB253) via job number
A-NR 200 .
Figure 3-16. Sequence Principle of FMA service MAC_EVENT
Operating system
User program
STEP 5 data
elements
Bus
monitoring
and
diagnostics
function
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Control
processor
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Communications
processor
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PLC
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FB L2-RECEIVE
with indication
a a a a
a
a a
a
a
a a
a
a
a a
a
a a a a
The indication consists of a maximum of 58 bytes. Bytes 0 to 7 are assigned to the header. The
error indications are stored in the sequence of their occurrence starting with byte 8 (up to 50 errors
can be recorded). Figure 3-17 shows the structure of the MAC_EVENT indication block.
The parameter values are stored in the MAC_
EVENT indication block as follows:
Figure 3-17. Structure of the MAC_EVENT Indication Block
a a a a a
a
a a a
a
a
a a a
a
a a a a a
9
a a a a a a
a
a a a a
a
a
a a a a
a
a a a a a a
8
Event parameter block
(see Table 3-10)
......
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a
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a
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a
a
a a a a a a a
a
a
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a
a
a a a a a a a
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a
a a a a a a a
a
a a a a a a a a a
Relevant
parameters
service_code
Type of service provided:
MAC-EVENT=20H
Indication Block
com_class
FMA_Indication=02
H
(event indication)
Byte
a a a a a
a
a a a
a
a
a a a
a
a a a a a
0
irrelevant
a a a a a
a
a a a
a
a
a a a
a
a a a a a
1
a a a a a
a
a a a
a
a
a a a
a
a a a a a
2
irrelevant
a a a a a
a
a a a
a
a a a a a
3-7
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a
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a
a
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3-26 EWA 4NEB 812 6112-02

Siemens SINEC L2 Specifications

General

Brand	Siemens
Model	SINEC L2
Category	Controller
Language	English