Modbus Protocol - ABB SensyMaster FMT230 Commissioning Instruction

20 SENSYMASTER FMT230, FMT250 THERMAL MASS FLOWMETER | CI/FMT230/250-EN REV. A
Digital output 41 / 42, 51 / 52
Can be configured via Modbus.
A
I E
41+
012345
51+
42-/
52-
B
I E
41+
R
B
51+
42-/
52-
Fig. 20: Passive digital outputs (I = internal, E = external)
A Passive digital output 41 / 42 as pulse or frequency output, Passive
digital output 51 / 52 as pulse output B Passive digital output 51 / 52
as binary output
Pulse / frequency output (passive)
Terminals 41 / 42, 51 / 52
Output 0 V ≤ U
"closed (pulse)" For f < 2.5 kHz: 2 mA < I
For f > 2.5 kHz: 10 mA < I
Output 16 V ≤ U
"open (pause)" 0 mA ≤ I
f 10.5 kHz,
max
Pulse width 0.05 ... 2000 ms
Binary output (switch output, passive)
Terminals 41 / 42, 51 / 52
Output "closed" 0 V ≤ U
2 mA ≤ I
Output "open" 16 V ≤ U
0 mA ≤ I
Switching function Can be configured via Modbus.
NOTICE
— Terminals 42 / 52 have the same potential. Digital outputs
41 / 42 and 51 / 52 are not electrically isolated from each
other.
R
B
R
B
012345
16...30 V DC
≤ 3 V
CEL
< 10 mA
CEL
< 30 mA
CEL
≤ 30 V DC
CEH
≤ 0.2 mA
CEH
≤ 3 V
CEL
≤ 30 mA
CEL
≤ 30 V DC
CEH
≤ 0.2 mA
CEH
4.7.4

Modbus protocol

NOTICE
The Modbus protocol is not secure, as such the intended
U
CE
R
application should be assessed to ensure that these protocols
B
I
CE
are suitable before implementation.
Modbus is an open standard owned and administrated by an
independent group of device manufacturers styled the Modbus
Organization (www.modbus.org).
Using the Modbus protocol allows devices made by different
U
CE
R
manufacturers to exchange information via the same
B I
CE
communication bus, without the need for any special interface
devices to be used.
G11597-02
2
R
D
Fig. 21: Communication via the Modbus protocol
1 Modbus master 2 Terminating resistor 3 Modbus slave 1
4 Modbus slave n ... 32
Modbus protocol
Configuration
Transmission
Baud rate
Parity
Stop bit
IEEE format
Typical response time
Response delay
(Response Delay
Time)
D
R
R
D
3 4
Via the Modbus interface or via the local
operating interface in connection with Asset
Vision Basic (DAT200) and a corresponding
Device Type Manager (DTM)
Modbus RTU - RS485 serial connection
2400, 4800, 9600, 19200, 38400, 56000,
57600, 115200 baud
Factory setting: 9600 baud
None, even, odd
Factory setting: odd
One, two
Factory setting: One
Little endian, big endian
Factory setting: Little endian
< 100 ms
0 ... 200 milliseconds
Factory setting: 10 milliseconds
1
2
A
B
GND
G11603