VS18/VS26
MAINTENANCE & INSTRUCTION BOOKLET
8.2.5 Diagnostics
The VS18/VS26 Profibus DP slave uses diagnostic telegrams as a high-priority response to
inform a master of its current state. The first 6 bytes contain the information specified by the
standard e.g. status of the state machine, correct/incorrect parameterisation and configuration.
Additionally, there is 1 byte of user diagnostics, which is used to show the state of the VA for the
valves. By monitoring the first bit of the user diagnostics byte the presence of the valve power
can be determined.
8.2.6 Profibus DP LED indicators
VB (green) –
This LED will only be energised when 24 volts is applied to the electronics
power terminal of the power supply connector.
5V (green) –
This LED will only be energised when a 24 volt supply is applied to the
electronic supply terminal of the power supply connector, indicating that the
logic circuit of the module is powered.
BA (green) –
This LED indicates the status of the network traffic, indicating when network
packages are received.
VA (green) –
This LED will only be energised when 24 volts is applied to the valve power
terminal of the power supply connector.
Indicator states during powering up and commissioning
Condition
VB
5V
BA
VA
Power
up
on on off on
Changing address during
commissioning
on on off on
Device in a stopped state
on
on
off
on
Device in an operation state
on
on
on
on
8.2.7 Profibus DP commissioning
Due to the increasing number of compatible master controllers it would be impractical to create
detailed instructions for commissioning the Norgren node on a particular master. All Norgren
Profibus products are conformance tested to the latest specification by an independent
authorised test site and are fully certified by the Profibus International Group. As a result, the
help guide and manual supplied with the users chosen PLC should be used during the
commissioning stages of each Norgren node.
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