Changing Profius Mode Of The Master Unit - Omron CJ Series Operation Manual

5 Operation
5-6-2

Changing PROFIUS Mode of the Master Unit

 PROFIBUS DP Network Modes
The PROFIBUS standard defines four different network modes, in which a Master Unit can operate.
The modes are:
• OFFLINE: The PROFIBUS Master Unit does not access the network, nor does it respond to
messages.
• STOP: The PROFIBUS Master Unit is on-line, but does not communicate with its slave
devices. It does communicate with other Master Units, in that it passes the token message.
• CLEAR: The PROFIBUS Master Unit is on-line and communicates with its slave devices. It
will parameterize all allocated slave devices but only read their input data. The Master Unit
does not send valid output data to the slave devices. Instead it will send empty output data
messages or messages containing zeros.
• OPERATE: The PROFIBUS Master Unit is on-line and communicates with its slave devices. It
will parameterize all allocated slave devices and exchange all I/O data for which it has been
configured.
 Normal Operating Modes
The OPERATE mode is the mode used for normal network operation. The CLEAR mode is the
mode used for situations which require a safety state to fall back to (see section 5-6-4 Using Auto-
CLEAR).
 Changing the Mode from the CJ1W-PRM21 Master DTM
In order to change the Unit's operational mode open the CJ1W-PRM21 Master DTM Diagnosis User
Interface. The figure below shows this Online Operations tab. Press the desired mode button in the
upper left corner of the window.
In order to change the network to OPERATE mode, i.e. start I/O data exchange, press the OPER-
ATE button. The OPERATE status of the Master Unit can be retrieved from the Monitor - Master sta-
tus tab in the same user interface.
5-42 CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)