Yokogawa EJX930A - Manual (Page 67)

<10. General Specifications>
10-3
IM 01C25R01-01E
Output specifications for Modbus Protocol Type
Item Description
Communication
protocol
2-wire half duplex RS-485 Modbus
Flow control None
Baud rate 1200, 4800, 9600*, 19200
Start bit 1 bit (Fixed)
Stop bit 1 bit*, 2 bits
Parity bit Odd, Even, None*
Transfer mode RTU (Remote Terminal Unit)
Data length: 8 bits
LSB (Least significant bit sent first)
Slave address 1* to 247
Support function 1: Read Coils
2: Read Discrete Inputs
3: Read Holding Registers
4: Read Input Register
5: Write Single Coil
8: Diagnostic (00: Return Query Data)
16: Write Multiple registers
43: Read device Identification
Bus termination Standard RS-485 bus termination
ON (bus end), OFF* (not bus end)
*: Factory default setting
Damping Time Constant (1st order)
Amplifier damping time constant is adjustable
from 0.00 to 100.00 seconds and added to
response time, applicable independently for
“DP, SP, ET, and flow” for HART, F OUNDATION
fieldbus and “DP, SP, and ET” for Modbus.
Update Period “◊”
Signal HART Modbus
Flow rate 100 ms ─
Differential pressure 100 ms 100 ms
Static pressure 100 ms 100 ms
External temperature 400 ms 400 ms
Total flow 1000 ms ─
Zero Adjustment Limits
Zero can be fully elevated or suppressed, within
the lower and upper range limits of the capsule,
applicable for DP, SP, and ET independently.
External Zero Adjustment
External zero for DP is continuously adjustable
with 0.01% incremental resolution of span.
Integral Indicator (LCD) “◊”
5-digit (Flow, DP, SP, and ET) or 6-digit (Total
flow) numerical display, 6-digit unit display and
bar graph.
The indicator is configurable to display one or
up to four variables periodically.
For Modbus, the indicator is configurable to
display up to 16 output values including RTU
output.
Burst Pressure Limits
[EJX910A] 69 MPa (10000 psi)
[EJX930A] 132 MPa (19100 psi)
Self Diagnostics
CPU failure, hardware failure, configuration
error, process alarm for differential pressure,
static pressure and external temperature.
SIL Certification (For HART protocol type)
EJX series transmitters except F
OUNDATION
Fieldbus and Modbus protocol types are
certified by TÜV in compliance with the
following standards;
IEC 61508: 2000; Part1 to Part 7
Functional Safety of electrical/electronic/
programmable electronic safety-related
systems; SIL 2 capability for single transmitter
use, SIL 3 capability for dual transmitter use.
Functions Applicable for HART Protocol
Revision 7
• Long tag supporting up to 32 characters
Long tag secures a better asset management
with abundant digits in its software.
• Enhanced burst mode and event notification
Advanced burst mode includes the variety
of transmission setting by specifying burst
variables, update period, and message trigger
mode, and event notification function gives
you alert signal based on the status change in
preset values and self-diagnosis.
• Squawk
Identifying the transmitter by displaying the
particular pattern on LCD
• Multidrop communication
Up to 63 transmitters can be connected. An analog
signal output available for one device in a loop.
Functions Applicable for Modbus Protocol
• Process data diagnosis
The process data status is provided for each
measured differential pressure, static pressure
and process temperature. Also device status
parameter is available for detail diagnosis.
• Long tag supporting up to 32 characters
Long tag secures a better asset management
with abundant digits.
• Squawk
Identifying the transmitter by displaying the
particular pattern on LCD.
• Multi-drop communication
Up to 32 transmitters can be connected.