Define Instruments RIO-MOD-RTU Operating Manual
RIO-MOD-RTU
Relay I/O with Modbus/RTU
1
General speci cations
16 isolated relay outputs Change over
Form C (10A 250V AC or 10A 30V DC),
1kHz scan rate. So ware selectable re-
lay state. Relay auto shuto feature (see
3.3).
16 selectable digital inputs Input type
select NPN (sink) or PNP (source) from
DIP switch A4 (see 2.5). 1kHz Input sam-
ple rate. Input voltage 5–24V.
LED indication on each relay output
and digital input channel (see 2.1–2.2)
Cable termination switches to switch
120Ω termination resistors across the
RS485/RS422 cables (see 2.7)
DIN rail mountable unit 35mm DIN rail.
Dimensions (H x W x D) 59 x 255 x 144mm
(2.32 x 10.04 x 5.67") - with plugs in
Contents
1 - Unit Overview ............................... 2
2 - Wiring & DIP Switches ................. 4
3 - Modbus Speci cations
& Programming .............................. 8
Communication Modbus/RTU (see 3.1
for more information)
DC power supply 24V DC ±15%
4 - Modbus Register De nitions ..... 10
RIO-MOD-RTU-MAN-15V02 (1009) Copyright © 2015 De ne Instruments
2
RXTXBEAT
PWR
16151413121110987654321
16151413121110987654321
No user serviceable parts.
Only to be installed by
service personnel.
See instructions before
connecting to supply.
SERIAL NO: 123456
COM
67
DI
16
66
DI
15
65
DI
14
64
DI
13
63
DI
12
62
DI
11
61
DI
10
60
DI
9
59
DI
8
58
DI
7
57
DI
6
56
DI
5
55
DI
4
54
DI
3
53
DI
2
52
DI
1
51
4321
PARIT Y
NPN/PNP
BAUD
OFF: NPN
ON: PNP
4
OFF: NONE
ON: EVEN
3
OFF
OFF
ON
ON
OFF
ON
OFF
ON
9600
19200
38400
115200
21
DIP SWITCH A
242322
21
20
19
181716
151413
12
11
10
9
8
7
6
5
4
3
2
1
82
8
RS485RS422
SERIAL PORT
-
SGND
RX+
RX-TX+
TX
-
0
C
CABLE TERMINATION
RS422
RX
RS485/422
TX
DIP SWITCH B
ADDRESS
(
BINARY
)
4321
000
0
124
8
484746
45
44
43
424140
393837
363534
333231
302928
272625
1
UNIT OVERVIEW
1.1 - Casing and terminals
NO
COM
NC
NO
COM
NC
NO
COM
NC
NO
COM
NC
NO
COM
NC
NO
COM
NC
NO
COM
NC
NO
COM
NC
NO
COM
NC
NO
COM
NC
NO
COM
NO
COM
NO
COM
NO
COM
NO
COM
NO
COM
NC
NC
NC
NC
NC
NC
RIO-MOD-RTU-MAN-15V02 (1009) Copyright © 2015 De ne Instruments
3
A Relay output 1
B Relay output 2
C Relay output 3
D Relay output 4
E Relay output 5
F Relay output 6
G Relay output 7
H Relay output 8
I Relay output 9
J Relay output 10
K Relay output 11
L Relay output 12
M Relay output 13
N Relay output 14
O Relay output 15
P Relay output 16
Q Digital inputs 1–16
R Power (24V DC ±15%)
S RS485/RS422 serial
port
T DIP switch A (baud
rate, parity, NPN/PNP)
U DIP switch B (station
address, binary)
V Cable termination
switches
1.2 - LED indicators
PWR illuminates when power is connected to the unit.
BEAT will ash every second to show that the unit is operating.
TX shows communication responses from the RIO-MOD-RTU to the Modbus
master device. Under normal operating conditions, this LED should turn on with
Modbus tra c.
RX shows communication requests from the Modbus master device to the RIO-
MOD-RTU. Under normal operating conditions, this LED should turn on with
Modbus tra c.
Relay output LEDs show the active state of relays 1–16. When the LED is o , the
respective relay is de-energised, and when the LED is on, the respective relay is ener-
gised (see 2.1 for more information).
Digital input LEDs show the active state of digital inputs 1–16. If the LED is on, the
respective digital input has been activated (see 2.2 for more informaion).
RIO-MOD-RTU-MAN-15V02 (1009) Copyright © 2015 De ne Instruments
4
2
WIRING & DIP SWITCHES
2.1 - Relays 1–16 (see 1.1A–P)
The relay outputs are located along the upper
and lower le sides of the unit (see 1.1A–P),
and are wired as shown (right).
LED indicators
The Relay Outputs LED indi-
cators show the active state of each relay. If the LED is o , the respective relay is
de-energised and the COM terminal is connected to the NC terminal. If the LED
is on, the respective relay is energised and the COM terminal is switched to the
NC
COM
NO
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NO terminal.
2.2 - Digital inputs 1–16 (see 1.1Q)
The digital inputs are located on the lower right side of the unit (see 1.1Q). The input
type for digital inputs 1–16 must be set to either NPN or PNP using DIP switch A4
(see 2.5). Note that the 16 digital inputs must be either all NPN or all PNP, but could
combine di erent types of sensors, as indicated below.
NPN (DIP switch A4: O )
All digital inputs must be driven from
outputs which can sink current (i.e. ac-
tive low).
Switch
contacts
Pushbutton/
Relay
Digital Input 1−16
Common
NPN
Digital Input 1−16
TTL
5V
Digital Input 1−16
Open
collector
output
RIO-MOD-RTU-MAN-15V02 (1009) Copyright © 2015 De ne Instruments
Common
0V
Common
PNP (DIP switch A4: On)
5
All digital inputs must be driven from
Switch
+ Supply (+5−+24V)
contacts
outputs which can source current (i.e.
active high).
PNP
+ Supply (+5−+24V)
Pushbutton/
Relay
TTL
5V
Digital Input 1−16
Digital Input 1−16
Open
collector
output
Digital Input 1−16
0V
Common
LED indicators
The Digital Inputs LED indi-
cators show the active state of each digital input. If the LED is on, the respective
digital input has been activated. The input LED will always indicate the activated
state of the input, regardless of what type of input is being used.
16151413121110987654321
2.3 - Power (see 1.1R)
The power terminal is located on the top side of the unit, in the far
right corner (see 1.1R). The RIO-MOD-RTU accepts 24V DC supply
(±15%).
2.4 - RS485/422 serial port (see 1.1S)
The serial port is located on the upper right
side of the unit (see 1.1S), next to the power
connector. It can be wired for either RS485 or
RS422 serial connections, as shown (right).
RS485 RS422
N/C
N/C
D−
D+
SGND
RX−
RX+
TX−
TX+
SGND
−
+
RIO-MOD-RTU-MAN-15V02 (1009) Copyright © 2015 De ne Instruments
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