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Operation
6
Operation
In PROFIBUS, two types of communication exist:
•
cyclic and
•
acyclic data exchange.
In 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 depends essentially on the number
of nodes and the amount of data being transmitted.
In acyclic data exchange, "service" data, for example device paramete-
rization 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 (Built-In-Slave or "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.
6.1.1
Cyclic Data Exchange
The BIS is a modular DPV1 slave with one slot. Two modules are avail-
able, each with a one-byte input and one-byte output. The input pro-
vides a combined status message for the Gateway. The status message
is coded as a PA Profile Status Byte (0x00: Bad unspecific, 0xA4: Good
Maintenance Required, 0x80: Good). For the actual value of the byte
under certain diagnosis conditions, please refer to table "Device Diag-
nosis Parameters" on page 42. If multiple diagnosis events are present,
the priority is as follows: Bad (highest priority), Good Maintenance re-
quired, Good (lowest priority). A dummy byte (0x00) must be sent as an
output data item.
6.1.2
Parameterization Options (Channel Assignment)
The three configuration modules Default, PA-BUS Configuration and
PA-BUS Configuration + Diag allow the parameterization of the follo-
wing values:
Subject to reasonable modifications due to technical advances.
40
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