Profibus Dp-V1 Services - Omron SYSMAC CS Series Operation Manual

PROFIBUS DP-V1 Services

Accessing the Error Log
from the PLC CPU
6-8

PROFIBUS DP-V1 Services

6-8-1 Configuring and Monitoring Slaves using DTMs
!Caution Since using PROFIBUS DP-V1 Class 2 messages are by definition aimed at
This will clear not only the Error Log stored in volatile memory, but also the
error log events stored in the non-volatile memory.
Note Clearing the Error Log is not possible, if an error, which was just added to the
Error Log is still active. The cause of the active error has to be removed first
before the Error Log can be cleared. Attempting to clear the Error Log, while
an error is still active, does not result in an Error message from the CS1/
CJ1W-PRM21 Master DTM.
The CS1/CJ1W-PRM21 Master DTM Diagnosis User Interface uses FINS
messages to read the CIO bit flags and access/clear the Error Log contents. A
user program running in the PLC CPU can use these same means to detect
new errors in the Error Log as well as read and clear them. Refer to sections
5-2-5 ERROR LOG READ (2102) and 5-2-6 ERROR LOG CLEAR (0203) for
details on FINS commands.
Next to the cyclic I/O data exchange, the CS1/CJ1W-PRM21 PROFIBUS
Master Units are capable of communicating using acyclic DP-V1 messages.
The following section explains the basic operation of DP-V1 functionality.
The FDT/DTM framework enables the configuration and monitoring of specific
parameters of PROFIBUS slaves. The DTMs support sending PROFIBUS
DP-V1 Class 1 (MSAC1) and Class 2 (MSAC2) messages directly to the
slaves. The slave DTMs, provided by the Slave's manufacturer, can therefore
perform application related configuration and monitoring.
Read Request
Read
Response
PROFIBUS
Slave DTM
Note The CS1/CJ1W-PRM21 master (communication) DTM will determine which
connection is initiated with the slave Unit. The default connection is PROFI-
BUS DP-V1 Class 2. If this is not supported by the slave, PROFIBUS DP-V1
Class 1 messages will be send.
setting parameters in a slave device, it is highly recommended to make those
settings with the PROFIBUS Master Unit in CLEAR mode, to prevent undesir-
able effects on I/O data.
Acyclic Read Request
CS1/CJ1W-
CX-Server
PRM21 DTM
Acyclic Read Response
Section 6-8
Acyclic Read Request
CS1/CJ1W-
PROFIBUS
PRM21 Unit
Acyclic Read
Response
PROFIBUS
Slave Unit
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