YOKOGAWA STARDOM FCN-RTU User Manual

<8. Detailed Description>
151
TI 34P02K35-02E
Jun. 6, 2018-00
PV1
PV2
AI1
AI2
Regulatory control
of analog signals
Calculations and
conditional decisions
NPAS_PVI_2
NPAS_PVI_1
PV1
PV2
Signal B
difference = | PV1 - PV2 |
If mode = “a”
If difference ≥ preset value, turn on signal A
If mode = “b”
If difference ≥ preset value, turn on signal B
Signal A
Create a user function block containing the
calculations and conditional decisions coded in ST,
and combine it with FBD or LD.
User function block
In this way, calculation and conditional decision application parts, for which FBD and
LD are not suited, are created in ST and then registered as user function blocks so
that ST can be combined with FBD or LD to create an easily comprehensible
application.
SEE ALSO
For details on user function blocks, see Section 4.7, “Application Encapsulation.”

YOKOGAWA STARDOM FCN-RTU Specifications

General

Model	FCN-RTU
Category	Controller
Input Voltage	24 VDC
Humidity Range	5 to 95% RH (non-condensing)
Enclosure Rating	IP20
Type	Remote Terminal Unit
Communication Protocols	Modbus, Ethernet/IP, DNP3, IEC 60870-5-101/104
Communication Interfaces	RS-232, RS-485, Ethernet
Input/Output	Digital and Analog I/O
Power Supply	24 VDC
Operating Temperature	-20 to 60 °C
Programming Languages	ST (Structured Text), LD (Ladder Diagram), FBD (Function Block Diagram)