YOKOGAWA UM33A/S006 User manual

User’s
Manual UM33A/S006
Digital Indicator with Alarms
(with RS485 Communication Function
(Modbus Master/Monitor))
User’s Manual
<Detailed Instructions> IM UM33A-01EN-S6
IM UM33A-01EN-S6
1st Edition
Functional
Enhancement

1
1Introduction
1.1 Overview
The following two functions are incorporated into the UM33A/S006.
• Modbus/RTU master function (read only)
• Modbus/RTU communication data monitor function
The Modbus/RTU master function allows the registers of Modbus slave devices on the same circuit
line to be read out. The Modbus/RTU communication data monitor function allows communication
between a Modbus master and slaves to be monitored and the response values of the slaves to be
displayed.
This instruction manual describes the difference between this TOKUCHU model and standard model.
Before reading this document, please read the instruction manual of standard model (document
number: IM 05P03D21-01EN)
2Model and Suffix Code
UM33A-010-□□/□/S006
□: Specified when ordering
Note 1: When the /LP option is specified, the RS-485 communication of the Type 2 code “1” is 2-wire
system.
Note 2: When the /CT option is specified, the product does not conform to the safety standards (UL and
CSA) or CE marking (Products with /CT option are not intended for EEA-market).
Model Optional suffix code Description
UM33A
Digital Indicator with Alarms (Power supply 100-240 V AC)
(provided with retransmission output or 15 V DC loop power
supply, 2 DIs, and 3 DOs)
Type 1 (Basic) -0 Standard type
1(Note 1)
1 additional DO (c-contact) and RS485 communication (Max.38.4
kbps, 2-wire/4-wire)
0NONE
-0 English (degC)
-1 English (deg C& deg F)
0White (Light gray)
1Black (Light ｃharcoal gray)
/LP 24 V DC loop power supply
/DC Power supply 24 V AC/DC
/CT (Note 2) Coating
/CV Terminal cover
/S006
RS485 communication (Max.38.4 kbps, 2-wire/4-wire)
MODBUS RTU Master/Moniter
Display language
TOKUCHU
Suffix code
Type 2 (Functions)
Type 3 (Open networks)
Case color
LPS option
Power supply option
Additional treatment option
Terminal Cover
Communication
Modbus
Modbus slave

2
3UM33A Modbus/RTU Master Function, Communication
Data Monitor Function
3.1 Modbus/RTU Master Function
This TOKUCHU product has a Modbus/RTU master function. The Modbus/RTU master function allows
the registers of slave devices on the same circuit line to be read out and displayed on the UM33A
screen.
From the master side, Modbus Coil, Discrete Inputs, Holding Resister, and Input Resister can be read
out. The supported Modbus/RTU function codes are 01 (Coil), 02 (Discrete Inputs), 03(Holding
Resister), and 04 (Input Resister). The maximum number of read commands and displays is eight.
Modbus master function
Description
Notes
Read
Allowed
Write
Not allowed
Maximum number of commands
8
8 maximum also
for displays
Supported function codes
01 (Coil: 1 to 9999)
02 (Discrete Inputs: 10001 to 19999)
03 (Holding Resister: 40001 to 49999)
04 (Input Resister: 30001 to 39999)
Supported data types
Bit
16 bit integer (signed only)
32 bit integer (signed only)
FLOAT
Maximum number of slave devices
that can be connected on the
same circuit line
31
VOLt
Up to 31 connected slaves with a maximum length of 1200 m
Slave Slave
Master
Slave

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3.2 Modbus/RTU Communication Data Monitor Function
This TOKUCHU product has a Modbus/RTU communication data monitor function. The Modbus/RTU
communication data monitor function allows the monitoring of register readout communication
between a Modbus/RTU master and slave devices on the same circuit line. This function allows
communication response values transmitted on the same circuit line to be displayed on the UM33A
screen without the UM33A sending communication commands.
Communication to Modbus Coil, Discrete Inputs, Holding Resister, and Input Resister can be
monitored. The supported Modbus/RTU function codes are 01 (Coil), 02 (Discrete Inputs),
03(Holding Resister), and 04 (Input Resister). The maximum number of read commands and displays
is eight.
For the continuous readout commands sent from the Modbus master side to the slave side, the first
setting parameter length of data (16 bits (1 register) for the Bit and 16 bit integer data types and 32
bits (2 registers) for the 32 bit integer and FLOAT data types) can be obtained.
Modbus communication data
monitor function
Description
Notes
Read command support
Allowed
Write command support
Not allowed
Maximum number of commands
8
8 maximum also
for displays
Supported function codes
01 (Coil: 1 to 9999)
02(Discrete Inputs: 10001 to 19999)
03(Holding Resister : 40001 to 49999)
04(Input Resister : 30001 to 39999)
Supported data types
Bit
16 bit integer (signed only)
32 bit integer (signed only)
FLOAT
Maximum number of devices that
can be connected on the same
circuit line
The total number of Modbus slave
devices and Modbus communication
data monitors is 31.
VOLt
Slave Slave
Monitor
Slave
Master
Up to 31 connected slaves and monitor with a maximum length of 1200 m

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3.3 Communication Conditions
○ Connected devices
Up to 31 devices equipped with Modbus RTU communication function can be connected.
○ Restrictions on connected devices
The communication conditions, namely the baud rate, parity, stop bit, and data length, of connected
devices must be the same as those of this instrument.
3.4 Simple flow for using Modbus RTU Master/Monitor
3.5 Display Error of Communication PV
For the FLOAT data type, the display error of communication PV is ± 1digit.

5
3.6 Data Types Supported by Communication PV and Display
Limits
The following table shows the display limits for each of the data types supported by communication
PV. For the FLOAT type, a fixed decimal place display and an auto range display (see section 3.4) are
available. The following table shows the figures for the fixed decimal place. Numbers outside the
-19999 to 99999 range ignoring the decimal point are displayed as ±OVER.
Table 3.5.1 Data types supported by communication PV and display limits
Decimal
place
parameter
Low limit
of
expression
High limit
of
expression
BIT
display range
16 bit integer
(signed)
display range
32 bit integer
(signed)
display range
FLOAT
display range
(when fixed
decimal point
is selected)
0
-19999
99999
High limit: 1
Low limit: 0
High limit:
32767
Low limit:
-19999
High limit:
99999
Low limit:
-19999
High limit:
99999
Low limit:
-19999
1
-1999.9
9999.9
High limit: 0.1
Low limit: 0.0
High limit:
3276.7
Low limit:
-1999.9
High limit:
9999.9
Low limit:
-1999.9
High limit:
9999.9
Low limit:
-1999.9
2
-199.99
999.99
High limit:
0.01
Low limit:
0.00
High limit:
327.67
Low limit:
-199.99
High limit:
999.99
Low limit:
-199.99
High limit:
999.99
Low limit:
-199.99
3
-19.999
99.999
High limit:
0.001
Low limit:
0.000
High limit:
32.767
Low limit:
-19.999
High limit:
99.999
Low limit:
-19.999
High limit:
99.999
Low limit:
-19.999
4
-1.9999
9.9999
High limit:
0.0001
Low limit:
0.0000
High limit:
3.2767
Low limit:
-1.9999
High limit:
9.9999
Low limit:
-1.9999
High limit:
9.9999
Low limit:
-1.9999

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3.7 L-H and H-L Register Arrangements When 32 bit LONG or
FLOAT Is Selected
For 32 bit integer and FLOAT types, L-H or H-L order can be selected. Set it according to the devices in use.
Figure 3.6.1 32 bit L-H register arrangement
Figure 3.6.2 32 bit H-L register arrangement
3.8 Display Screen (Communication PV1 to Communication PV8)
The measured value of the specified register (MB.ST menu) is displayed. Communication PV number
is shown on the group display. Only when the acquired data type is 16 bit integer, hexadecimal
expression can be used by changing FRMT (MB.ST menu) to HEX.
When the acquired data type is FLOAT and the auto range function is in use, a unit prefix is displayed.
The unit prefix display can be switched between “T, G, M, k, etc.” and exponential type (E03, E00,
etc.). Table 3 shows the unit prefix display during auto range. If the value is smaller than ±p (pico)
range when auto range is in use, “0” is displayed.
k VOLt
Group display
Prefix display
Unit display
Communication
PV display

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Table 3.7.1 Unit prefix display
Unit display (when unit is selected)
Unit display (when exponent is selected)
T (tera)
E12
G (giga)
E09
M (mega)
E06
k (kilo)
E03
No display
E00
ML (milli)
E-03
u (micro)
E-06
N (nano)
E-09
P (pico)
E-12
The unit display shows the selected unit (VOLT, A, C, etc.).
The display can be shown or hidden with the communication ONOFF (MB.ST menu) value.
When the communication function ONOFF (MB.ST menu) values are all set to hidden, only the PV
input is displayed.
If the PV input is hidden, at least one of the ONOFF (MB.ST menu) value is ON.
3.9 Display Screen (PV Input)
The PV input is displayed.
The unit (VOLT, A, C, etc.) is displayed.
The display can be shown or hidden with display U.PV (KLOC menu) OFF/ON value.
When the communication function ONOFF (MB.ST menu) (1 to 8) values are all set to OFF, the PV
input cannot be hidden. When any of the communication function ONOFF (MB.ST menu) (1 to 8)
values is ON, the PV input can be hidden.
VOLt
Unit display
Communication
PV display

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3.10 Auto/Manual Switching of the Operation Screen
When auto switching of the operation screen is used, the PV input value switches automatically
between communication PV1, communication PV2, . . . communication PV8 at the specified display
update interval (3S, 10S, 30S, 1M).
When manual switching of the operation screen is used, the PV input value is switched between
communication PV1, communication PV2, . . . communication PV8 every time the DISP key is
pressed.
You can switch between auto switching and manual switching using the Fn key. Switching is also
possible using parameters.
3.11 Display Screen for Communication Errors
When a communication error occurs, the PV display area of the communication PV1 to
communication PV8 measurement display operation screen blinks.
In addition, if a communication error occurs in any of the communication PVs (PV1 to PV8), the EV
lamp 8 lights.
When a communication error occurs, the previously acquired value is displayed.
Note: On the standard UM33A, the decimal point blinks when a communication error occurs. This
feature is not available on this TOKUCHU product.
k VOL t k VOL t k VOL t
VOL t
k VOL t k VOL t k VOL t
VOL t
k VOL t
●
1.000
k VOLt

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3.12 Retransmission Output
Retransmission output can be produced using 4-20mA by selecting PV, communication PV1 to
communication PV8.
The high and low limits of the scale are as follows:
○When RTS=PV: RTL + 1 digit to 30000
-19999 to RTH-1digit
The decimal place is the same as that of the PV input.
(This is the same as the standard UM33A.)
○When RTS=C.PV: RTL + 1 digit to 99999
-19999 to RTH-1digit
The decimal place is the same as that of SDP in MB.NT.
The setting range is the same also for FLOAT.
If communication is disconnected, retransmission output produces the
previously saved value.
Note: The communication PV retransmission output continues produce the selected communication
PV even when the operation screen is changed.
Note: Note that if the span exceeds 49999, the resolution of the retransmission output will
decrease.
Note: If the auto range function is enabled when FLOAT is in use, do not use the
retransmission output function.
Note: The retransmission output will be under 4mA until the communication establishes
because the initial value of communication PV is set to -19999 at Power ON.