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6. Configuring the Gateway
6.11.2.3. Configuring the Response
Next select the “Response” element from the Modbus command.
The various elements of the configuration of the response for this
command are shown opposite. The values displayed correspond to
the default values for any new command.
These elements allow you to configure a single aspect of managing the command, described below. Each of
them is described, in order, in the table below.
Configuration
element
Description
Trigger byte This element is used by the gateway to activate the unitary incrementation of an 8-bit
counter in order to notify the Profibus-DP master of the receipt of a new response to the
associated Modbus command. It takes one of the following two values:
- Disabled.................................. Default configuration. The gateway does not increment any
counter on receipt of the Modbus response.
- Enabled................................... Each time that the gateway receives a new response to the
associated Modbus command, it increments the value of an 8-bit counter designated by
the “Trigger byte address” element (see below). If used, this counter allows the Profibus-
DP master, for example, to only consider the response’s corresponding data when this
counter’s value is incremented.
Trigger byte
address
This element is only used by the gateway if the element “Trigger byte” is set to “Enabled”. In
this case, it specifies the address, in the gateway’s input memory (16#0002 to 16#00F3), of
an 8-bit counter managed by the gateway.
When the gateway receives a response to the associated Modbus command, it increments
the value of this counter in a unitary manner (value = value+1). So the Profibus-DP master
must have access to this counter in the same way as for the periodic input registers from
the TeSys U motor starters.
This mode allows the Profibus-DP master to be informed that a new response is available.
This can be useful, for example, if it is possible that the data from two consecutive
responses may be identical.
N.B.: In the specific case of the gateway’s default configuration, the “Trigger byte” element for
responses to the “Transactions 1” and “Transactions 2” personalized commands of the
“TeSys U n°1” node is set to “Enabled”. Hence, the management of responses to read and
write commands for parameters is
event driven.
The “Trigger byte address” elements of the “Response” elements of these two commands
are configured at addresses 16#001E and 16#001F. These are the “parameter read/write
response counters”. Considered under Profibus-DP, SyCon, and PL7 PRO, these two data
are configured the same way as the other inputs (see chapter 4.2.9 Configuring the
Gateway I/O under PL7 PRO, page 32) and both correspond to the %IW4.0.15 input.