Siemens SITRANS FST030 - Connecting Modbus

Terminal layout




Ca
Cb
Cc
Cd
24 V DC or
110/230 V AC




1/1/
For configuration of the software parameters, see Input/output configuration (Page 44). More
information can be found in the Function Manual.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Power supply L/+ N/-
Active/+ Active/ -
Passive/+ Passive/-
Active/+ Active/ -
Passive/+ Passive/-
Active/+ Active/ - Active/+ Active/ -
Passive/+ Passive/- Passive/+ Passive/-
NO NO NO NO
NC NC NC NC
Channel 1 HART
Current output HART
Channel 2 output
Current, Frequency, Pulse and Status
Channel 1 MODBUS
Channel 1 PROFIBUS
Ch2
HW configuration
SW configuration
Power supply
Ch1
Terminals
Ch4
Ch3
In
+ (B) - (A)
Out
+ (B) - (A)
In
+ (B) - (A)
Out
+ (B) - (A)
Channel 3 & 4 Relay
Status output
Channel 3 & 4 Input and output
Outputs: Current, Frequency, Pulse and Status
Inputs: Digital
Figure 5-9 Termination/configuration overview
Ex and non-Ex versions
● For Ex versions active or passive current output is preselected at ordering and cannot be
changed.
● Non-Ex versions can be connected as either active or passive.
5.5.2 Connecting Modbus
Current output Modbus
1. Open enclosure lid.
2. Remove blind plug and fit cable gland.
Connecting
5.5 Transmitter power supply, communications and I/Os connection
SITRANS FST030 (Modbus)
Operating Instructions, 08/2018, A5E37367739-AD 41