TMT84 Operation
Endress+Hauser 25
5.4.3 Configuring the device address
Note the following points:
• The address must always be configured for a PROFIBUS
®
PA device.
Valid device addresses are in the range 0 to 125. Each address can only be assigned once In a
PROFIBUS
®
PA network. The device is not recognized by the master if the address is not
configured correctly.
Address 126 is used for initial operation and service purposes.
• All devices are delivered ex works with the address 126 and software addressing.
The hardware address is configured using DIP switches 1 (1) - 7 (64). The "SW-HW" DIP switch
must be set to "HW" and the "ADDR ACTIVE" DIP switch to "ON" to use the configured hardware
address.
The transmitter must be restarted so that the DIP switch settings are adopted by the TMT84 and
saved.
Software address means that the saved bus address can be changed via a DDLM_SLAVE_ADD
message. In contrast, if a display with a valid address is fitted, this means that the address configured
on the display is used and a DDLM_SLAVE_ADD message is ignored.
Therefore, if the display is removed or a display is fitted with the "SW/HW" DIP switch set to SW
("ADDR ACTIVE" DIP switch set to ON), this means that the currently saved bus address can be
changed once more via a DDLM_SLAVE_ADD message. The currently saved bus address is used
until it is changed via a DDLM_SLAVE_ADD message. When this happens, the bus address is
changed directly on receipt of the message and does not require the device to be restarted.
a0009701
Fig. 13: Configuring the device address using the example of bus address 49.
DIP switch set to ON: 32 + 16 + 1 = 49. Furthermore, "SW/HW" DIP switch set to "HW" and "ADDR ACTIVE" set to
"ON".
• Fitting the display during operation
The DIP switches for the bus address are checked during operation and a configured, valid bus
address (DIP switches: SW/HW set to HW; ADDR ACTIVE set to ON; bus address < 126) is saved
and adopted the next time the device is restarted.
The attachment of the display does not effect the bus address provided the "ADDR ACTIVE" DIP
switch is set to OFF. If the switch is set to ON, and a valid bus address (DIP switches: SW/HW
set to HW; ADDR ACTIVE set to ON; bus address < 126) configured, this is adopted the next
time the device is started.
If the device does not start within 30 minutes of changing the bus address, this change is rejected
and the device retains the last saved address.
If the "ADDR ACTIVE" DIP switch is set to ON and the "SW/HW" DIP switch set to SW, the bus
address is not affected.
• Removing the display during operation
If the display is removed during operation, the TMT84 uses the address saved in the device and
operation continues without restriction.
• Resetting the bus address to default value 126
1. Fit a display with a valid HW address (DIP switches: SW/HW set to HW; ADDR ACTIVE set
to ON; bus address < 126).
2. Wait until the company logo appears on the display.
3. Remove the display and set the "SW/HW" DIP switch to SW.
4. Fit the display once more and wait until the company logo appears.
5. The bus address 126 is used when the device is restarted.
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