Bühler technologies Modbus RTU TC-MIDI plus Notice De Montage page 15

TC-MIDI (+)
Plug numbering
Alarm contact S2
Digital output S4
1 - not used
2 - RS485 A
3 - GND/Common
4 - RS485 B
5 - Shielding
The clamping areas for S1 and S2 are 8 - 10 mm (0.31 – 0.39
inches) in diameter.
4.4 Signal outputs
The device provides different status signals. The maximum
switching load of the alarm outputs is limited to 250 V AC/
150 V DC, 2 A, 50 VA each.
An alarm is triggered by the alarm contact/status output (S2)
if the temperature of the cooler is outside the specified limits.
It does not indicate if the alarm was triggered due to excess
temperature or insufficient temperature.
The front film has three LEDs:
Colour Marking Function
Red S2 High/low temperature, device error
Yellow S1 ---
Green OP Normal operation
The LEDs OP and S2 indicate the device status similar to S2.
If the option "temperature signal" is built in, the unit has a
signal output via the analogue output to indicate the actual
cooler temperature.
When the moisture detector (optional) is installed, an alarm is
activated by the alarm contact/status output (S2) if the mois-
ture is still present in the prepared sample gas. Thereby, no
distinction is made between the alarm/cable break triggered
by moisture detector 1 or 2. This information is displayed by
an error message instead.
The temperature signal can be read via the panel plug (S3) us-
ing the M12x1 connector. This plug is located next to the mois-
ture detector connectors at the top of the cooler.
BX440016 ◦ 04/2023
Electric supply S1
Analog output S3
1 - not assigned
2 - not assigned
3 - GND
4 - 4-20 mA out
5 - shield
Description of signal outputs
Function/ Description
contact type
Re- internal the following
gard- changeover device
ing contact: statuses can
S2) max. be indicated
250 VAC/ via two
150 VDC, 2 A, switching
50 VA outputs:
Re- 4-20 mA ana- Signalling of
gard- logue output actual tem-
ing (R <500 Ω) perature
Load
S3)
Re- Digital out- Modbus RTU
gard- put (RS-485)
ing
S4)
5 Operation and control
NOTICE
The device must not be operated beyond its specifications.
After switching on the cooler the block temperature will be
displayed. The display will flash until the block temperature
has reached the preset target value (± adjustable alarm
range). The status contact is in the Alarm position.
Once the target temperature range has been reached, the
temperature will continuously be displayed and the status
contact switches over.
Contact between 3 and 2
closed (alarm)
• No mains voltage
and/or actual tem-
perature outside the
alarm thresholds
Contact between 3 and 1
closed (OK)
• Mains voltage at-
tached + actual tem-
perature within the
alarm thresholds
With moisture detector
option
Contact between 3 and 2
closed (alarm)
• The moisture de-
tector registers resid-
ual humidity in the
sample gas or cable
break: Error message
Contact between 1 and 3
closed (OK)
• no residual moisture
in measuring gas/no
cable break
With temperature signal
option
T = -20 °C ≙ (-4 °F) ->
cooler
4 mA/ 2 V
T = 5 °C ≙ (41 °F) ->
cooler
9 mA/ 4.5 V
T = 60 °C ≙ (140 °F) ->
cooler
20 mA/ 10 V
Interface default values
Baudrate – parity – stop
bit:
19200 – Even – 1
Default ID: 10
The bus lines are not in-
ternally terminated.
Bühler Technologies GmbH 15