= 2
- Pressing the key for at least 1 second, it is possible to
enable/disable a continuous cycle (see continuous cycle function).
= 3
- Pressing the key for at least 1 second, it is possible to select
one of the 2 memorised set point in rotation. Once selection has
been made, the display will flash the active set point code for about
1 s (SP 1or SP 2).
= 4
- Pressing the key for at least 1 second, it is possible to switch the
instrument from the ON status to Stand-by status and vice versa.
4.13 - RS 485 SERIAL INTERFACE
The instrument can be equipped with a RS 485 serial
communication interface, by means of which it is possible to
connect the regulator with a net to which other instruments
(regulators of PLC) are connected, all depending typically on a
personal computer used as plant supervisor. Using a personal
computer it is possible to acquire all the function information and to
program all the instrument’s configuration parameters. The software
protocol adopted for TLY 26 is a MODBUS RTU type, widely used
in several PLC and supervision programs available on the market
(TLY series protocol manual is available on request).
The interface circuit allows the connection of up to 32 instruments
on the same line.
To maintain the line in rest conditions a 120 Ohm resistance (Rt)
must be connected to the end of the line.
The instrument is equipped with two terminals called A and B which
have to be connected with all the namesake terminals of the net.
For the wiring operation they must be interlaced with a double cable
(telephonic type).
Nevertheless, particularly when the net results very long or noised and
being present potential differences between the GND terminals, it is
advisable to adopt a screened cable wired as in the drawing.
TLY26 n.2
TLY26 n.1
7
GND
8
A
B
9
A
B
TLY26 n.N
GND
A
GND
B
shield
A
Interface
RS485
GND
B
HOST
(PC/PLC)
120 ohm
Rt
7
8
9
7
8
9
If the instrument is equipped with a serial interface, the parameter to
be programmed are the following present in the parameters group
“
]
SEr”
:
"Add"
: Address of the station. Set a different number for each
station, from 1 to 255.
Note:
The baud-rate are fixed at 9600 baud.
If an attempt is made to enter the programming from the keyboard
whilst a communication through the serial port is in progress the
instrument will visualise
"buSy"
to indicate the busy state.
4.14 - ACCESSORIES
4.14.1 - PARAMETERS CONFIGURATION BY KEY A01
The instrument is equipped with a connector that allows the transfer
from and toward the instrument of the functioning parameters
through the device
ASCON TECNOLOGIC A01
with
5 poles
connector.
This device it is mainly useable for the serial programming of the
instruments which need to have the same parameters configuration
or to keep a copy of the programming of an instrument and allow its
rapid retransmission.
To use the A01 device it is necessary that the device or instrument
are being supplied.
Instrument supplied and device not supplied
SUPPLY
Instrument supplied from the device
SUPPLY ADAPTER
12 VDC
AC SUPPLY
For additional info, please have a look at the KEY01 instruction
manual.
4.14.3 - “TVRY” REMOTE DISPLAY
If is present the special output it is possible to connect to the
instrument the remote display
ASCON TECNOLOGIC TVR Y
with 3
wires connection (3S) through a cable that can have a maximum
length of 10 m.
The device TVR Y, directly supplied by the instrument, it allows to
visualize the temperature measured by the probe Pr1 through a 2 ½
digit display.
cable 10 m MAX.
TVR Y (3S)
SUPPLY
+
-
S
+
S
-
For additional info, please have a look at the TVR Y instruction
manual.
5 - PROGRAMMABLE PARAMETERS TABLE
Here below is a description of all the parameters available on the
instrument. Some of them may not be present, either due to the fact
they depend on the type of instrument or because they are
automatically disabled as unnecessary.
Group
]
SP
(parameters relative to Set Point)
Par.
Description
Range
Def.
Note
1
SPAt
Active Set point
1 ÷ 2
1
2
SP1
Set Point 1
SPLL ÷ SPHL
0.0
3
SP2
Set Point 2
SPLL ÷ SPHL
0.0
4
SPLL
Minimum Set Point
-58 ÷ SPHL
-50.0
5
SPHL
Maximum Set Point
SPLL ÷ 302
100.0
Group
]
InP
(parameters relative to measuring inputs)
Par.
Description
Range
Def.
Note
6
SEnS
Probes Type
Ptc - ntc
Ptc
7
OFS1
Pr1 Probe (cell)
Calibration
-30 ÷ 30
°C/°F
0.0
8
OFS2
Pr2 Probe (evaporator)
Calibration
-30 ÷ 30
°C/°F
0.0
9
Pr 2
Pr2 Probe Presence
(evaporator)
On - OFF
On
10
Unit
Unit of measurement
°C -°F
°C
11
dP
Decimal point
On - OFF
On
Ascon Tecnologic - TLY26
- OPERATING INSTRUCTIONS - Vr. 02 - 04/14 - ISTR MTLY26ENG02 - PAG. 8