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LTM-BA Modbus & Serial
Output
Transmitter
& Batch Controller
With two relay outputs for automated batch
control.
DIN Rail mounted, digitally
programmable.
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Standard
Features
- Selectable Modbus or
Laurel ASCII protocol.
- Modbus RTU or ASCII modes,
2-wire connection, up to 247 digital addresses.
- 6-digit readings
scalable to
±999,999.
- Transmittal of batch
total, grand total, number of batches, and rate.
- Settable delay
between cycles.
- Dual solid state relays assignable
via software to
batch
total, prewarn, grand total, number of batches, or rate.
- Local count-up from 0 to
a preset, or count-down from a preset to 0.
- Pulse input rates
from 0 Hz to
1
MHz.
- Signals from turbine flow meters,
magnetic pickups, NPN or PNP transistors, digital logic, or AC from 12 mV to 250 Vac.
- Selectable "count by"
of 10 or 100 with rounding.
- Built-in 5V, 10V
or 15V dc
excitation supply to power sensors.
- DIN rail mount package only 22.5 mm thick.
- Detachable screw clamp plug connectors.
- Easy setup with PC-based
Instrument Setup Software
- 0-10V, 4-20 mA or 0-20 mA analog output,
scalable, isolated.
- Universal AC power, 95-240 Vac ±10%
- Priced at only
$275 (basic batch transmitter)
Options:
- Low voltage
power, 10-48 Vdc or 12-30 Vac.
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Description
The Laureate
LTM-BA batch serial output
transmitter / controller is a
powerful, cost-effective workhorse in the form of a
22.5 mm (0.89") thick DIN rail
package with
removable screw clamp plug connectors. The unit can perform autonomous batch
control as instructed by a host computer via the Modbus protocol, and also
transmit the current batch total (Item #1), grand total or number
of batches (Item #2), and flow rate (Item #3), as well as
peak for #3 (rate). All transmitted values are scaled to engineering units of volume or flow
with to six-digit resolution.
- A first solid state relay serves as the batch relay to control
repetitive fill operations. It repeats the batch cycles continually with a
programmable delay from 10 ms to 199.99 sec, or based on an external
control input. The batch total (Item #1) can be set up to count up from
zero to a preset limit, or down from a preset limit to zero.
A second solid state relay can be assigned to the batch total (Item #1) to
serve as a pre-warn to slow down filling near the setpoint, to the grand total or number
of batches (Item #2), or to flow rate (Item #3).
 The dual-channel signal
conditioner accepts pulses from all types of turbine flow meters and most industrial
transducers with a pulse output such as proximity switches with PNP or NPN output, TTL or
CMOS logic, magnetic pickup pulses down to 12 mV, as well as AC inputs up to 250 Vac.
Jumper
selections provide optimum operation for different sensor types and noise
conditions. A built-in 5V, 10V or 24V dc
excitation supply can power proximity switches and other sensors, eliminating the need
for an external power supply.
LTM Series serial output transmitters send data via an isolated serial port, which is user
configurable for RS232 or RS485 and full or half duplex operation. Three
protocols are user selectable: Modbus RTU, Modbus ASCII, or Laurel ASCII. Modbus operation
is fully compliant with Modbus Over Serial Line Specification V1.0 (2002).
The Laurel ASCII
protocol allows up to 31 Laureate devices to be addressed on the
same RS485 data line. It is simpler than the Modbus protocol and is
recommended when all devices are Laureates. It also allows use of
Laurel Datalogging Software.
Standard features of Model
LTM-BA include:
- Serial data output, isolated. User selectable RS232 or RS485, half or full duplex, Modbus or
Laurel ASCII protocol.
- Dual solid state relays for control or alarm, isolated.
Rated 120 mA at 130 Vac or 170 Vdc.
- Transducer excitation output, isolated. User selectable 5V@100 mA, 10V@120 mA or 24V@50
mA.
-
Analog transmitter output, 16-bit, user scalable and isolated. User selectable 4-20 mA,
0-20 mA or 0-10V levels.
- Universal AC power supply for 95-240 Vac ±10%.
Easy Transmitter programming is via
Laurel's Instrument Setup Software,
which runs on a PC under MS Windows. This software can be downloaded from this website at no charge. The required transmitter-to-PC interface cable is available from
Laurel (P/N CBL04).
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Specifications
LTM-BA Modbus & Serial I/O Transmitter & Batch
Controller
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Pulse Input |
Types
Ch A Frequency, Max
Ch B Frequency, Max
Signal Ground
Minimum Signal
Maximum Signal
Maximum Frequency
Contact Debounce
Time Base Accuracy |
AC,
pulses from NPN, PNP transistors, contact closures,
magnetic pickups.
1 MHz.
250 kHz.
Common ground for channels A & B.
Nine ranges from (-12 to +12 mV) to (+1.25 to
+2.1V).
250 Vac
1 MHz, 30 kHz, 250 Hz (selectable).
0, 3, 50 ms (selectable).
Quartz crystal calibrated to ±2 ppm. |
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Serial Data Output
(standard) |
Signal levels
Data Rates
Output Isolation
Serial Protocols
Devices on RS-485 Line
Modbus Addresses
Modbus Modes
Modbus Compliance |
RS232 (default) or RS485 (half duplex)
300, 600, 1200, 2400, 4800, 9600, 19200 baud
250V rms working, 2.3 kV rms per 1 min test
Modbus RTU, Modbus ASCII, Laurel ASCII (selectable)
32 max without a repeater.
247 max
RTU or ASCII, 2-wire
Modbus over Serial Line Specification V1.0 (2002) |
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Dual Relay Output (standard) |
Relay Type
Load rating |
Two solid state relays, SPST, normally open,
Form A
120 mA at 130 Vac or 170 Vdc, 28 ohms in series |
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Transducer Excitation Output (standard) |
Output levels
Output isolation |
5V@100 mA, 10V@120 mA, 24V@50 mA (jumper
selectable)
50V from signal ground |
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Analog Output (standard) |
Output Levels
Compliance, 4-20 mA
Compliance, 0-10V
Output Resolution
Output Accuracy
Output Isolation |
4-20 mA, 0-20 mA, 0-10 Vdc (jumper selectable)
10V ( 0-500 ohm load )
2 mA ( 5 kOhm load or higher)
16 bit DAC
±0.02% of output span plus conversion accuracy
250V rms working, 2.3 kV rms per 1 minute test |
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Power Input |
Standard power
Low power option
Frequency
Power Isolation |
95-240 Vac ±10% or 90-300 Vdc (DC operation not UL approved)
12-30 Vac or 10-48 Vdc
DC or 47-63 Hz
250V rms working, 2.3 kV rms per 1 min test |
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Mechanical |
Case Dimensions
Case Mounting
Electrical Connections |
120 x 101 x 22.5 mm
35 mm rail per DIN EN 50022
Detachable screw clamp plug connectors |
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Environmental |
Operating Temperature
Storage Temperature
Relative Humidity |
0°C to
70°C
-40°C to 85°C
95% at 40°C, non-condensing |
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Applications |
Drum Filling Application Utilizing Two Relay Outputs |
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In this drum filling application, the Laureate utilizes
its two relays to control the pump. The
Prewarn relay slows down the pump near the preset to avoid overshoot. The Batch relay
stops the pump at the preset. |
Controlling the Mixing of Materials |
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Multiple Laureate batch controllers can be used in
combination to control the mixing of materials in the proper ratio. Each feed line is
equipped with its own pump, flow meter, and Laureate. Controller
setup and monitoring of the mixing operation are facilitated by Modbus
communications, which allow a single data line to handle multiple controllers. |
Up-Counting Batch Control |
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In up-counting batch control, the Laureate counts up from
zero to a preset maximum. A prewarn level is available to slow down filling near the
preset to avoid overshoot. A time delay can be programmed from the end of each batch to
the start of the next batch. |
Down-Counting Batch Control |
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In down-counting batch control, the Laureate counts down
from the preset maximum to zero. A prewarn level is available to slow down filling or
emptying near zero. Again, a time delay can be programmed from the end of each batch to
the start of the next batch. |
Discrete Filling and Batch Counting |
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The Laureate batch controller is ideal for discrete
manufacturing as well as repetitive fill operations. In this example, the Laureate counts
bottles which it then groups into sixpacks. Its Grand Total capability can be used to
track bottles or sixpacks. |
Pinout
LTM-BA Modbus & Serial I/O Transmitter
& Batch Controller
Ordering
Guide
LTM-BA Batch Controller & Transmitter,
Modbus
or Laurel ASCII Protocol Serial I/O
Click
on the radio buttons to build a model number with pricing.
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