Operation; Built-In Slave (Bis) Description - Pepperl+Fuchs FieldConnex Segment Coupler 3 Manual

PROFIBUS Power Hub Segment Coupler 3 (SK3)

Operation

6 Operation
In PROFIBUS, the following 2 types of communication exist:
Cyclic data exchange
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Acyclic data exchange
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During cyclic data exchange, user data is exchanged between the master (process control
system) and slave (field device) at regular intervals. User data includes measurement values,
limit position feedback and output data, etc. The bus cycle time essentially depends on the
number of nodes and the amount of data being transmitted.
In acyclic data exchange, "service" data, e.g., device parameterization or diagnostic
information, is transmitted. A number of parameters of the HD2-GTR-4PA gateway module can
be adjusted both through acyclic parameterization (using the DTM) and via the process control
system. The advantage of parameterization via the process control system is the simplification
of device replacement since no additional effort is required in addition to replacing the physical
device.
6.1

Built-In Slave (BIS) Description

The gateway has an integrated slave, a socalles "built-in slave" (BIS) with a DP address that
can be configured with the DIP switch on the motherboard. As a device participating in cyclic
data exchange, the BIS returns function monitoring and diagnostic data to the master.
Cyclic Data Exchange
The BIS is a modular DPV1 slave with 1 slot. 2 modules are available, each with a 1–byte input
and 1–byte output. The input provides a combined status message for the gateway. The status
message is coded as a PA profile status byte:
0 x 00: Bad, unspecific
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0 x A4: Good, maintenance required
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0 x 80: Good
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For the actual value of the byte under certain diagnostic conditions, see chapter 10.2, table on
diagnostic parameters. If multiple diagnostic events are present, the priority is as follows:
1. Bad (highest priority)
2. Good, maintenance required
3. Good (lowest priority)
A dummy byte (0 x 00) must be sent as an output data item.
Parameterization Options (Channel Assignment)
The following 3 configuration modules exist:
Default
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PA bus configuration
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PA bus configuration + diag.
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These configuration modules enable the parameterization of the following values:
Default:
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• None
PA Bus Configuration:
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• Watchdog time
• PA retry limits
• Number of activated PA segments
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