Levitronix BFS-i10 User Manual page 14

•
RS485 interface: To use RS485 as a control or service interface, an initialization resistor network
according to Figure 14 should be used to ensure stable communication and avoid disturbance effects.
For service and debugging purposes with the Levitronix
cable (initialization network included) can be ordered according to Table 2. Do not use multiple master
devices at the same time.
•
RS485 Fieldbus Multi-System Arrays: Several systems can be directly connected to the same
RS485 master. Following points and information shall be considered:
a. Address setting of the fan units can be done with the Levitronix
b. A termination resistor is recommended for long bus lengths. Do not use closed ring
arrangements. Contact Levitronix
details and support.
Pin Wire Color Description
Digital input 1
B4 Pink
Enable / reset
Digital input 2
B5 Gray
Process mode
B3 Yellow Digital input ground
Analog input 1
B6 Violet
Setpoint speed or
setpoint process value
Analog input 2
B1 Gray-pink
Actual process value
(pressure or flow sensor)
B2 Blue Analog input ground
Digital output 1
A2 Brown
System state signal
Digital output 2
A3 White
Error signal
Analog output
A1 Blue-red Actual speed or
actual process value
A5 Brown-green RS485 +
A6 White-yellow RS485 -
A4 White-green Ground
Table 6: Configuration of PLC connector for standard firmware
* Levels configurable in EEPROM editor of Levitronix
PL-3505-00, Rev00, DCO# 21-249
®
Levels
5...24 V (min. 30 ms, edge triggered)

SPEED or PROCESS
or RESET
0 V (min. 30 ms, edge triggered)

STANDBY
5...24 V (min. 30 ms)

PROCESS Control
0 V (min. 30 ms)

SPEED Control
Speed mode:
4...20 mA * =
Process mode:
4...20 mA * =
4...20 mA * =
Circuit closed

Power output ACTIVE
Circuit open

Power output NOT active
Circuit closed

NO error present
Circuit open

ERROR(s) present
Speed:
4...20 mA * =
Process value:
4...20 mA * =
Modbus protocol
GND / earth
For other PLC configurations refer to alternate firmware documentation.
®
Service Software an RS485 to USB converter
Technical Service department (see Section 6.3) for further
Notes
Positive edge:
- Turns the system ON from state STANDBY
(PROCESS if digital input 2 is on, else SPEED)
- Resets the system from state ERROR
Recommended delay between reset and enable-on
positive edges: 500 ms
Negative edge:
- Turns the system OFF, if it was started by digital in 1
- Else no effect
Input logic may be inverted via Service Software or
Modbus protocol.
Switch between process control (closed loop pressure
or flow control) and speed control if system was
started by digital in 1 (no effect else)
Input logic may be inverted via Service Software or
Modbus protocol.
Reference for digital inputs
Analog input 1 is enabled if the system was started by
a positive edge on digital input 1 and disabled as soon
as the power output is deactivated. Message 80h "PLC
0...7400 rpm *
analog input active" indicates that the input is active.
Setpoint speed or process requests over Modbus or
0...100 % *
Service Software will be overridden when analog input
1 is active.
Connect to an external pressure or flow sensor to use
0...100% *
process control mode
Reference for analog inputs
Indicates if the system's power output is ON or OFF
Ground (A4) is reference
Indicates if errors are present
Ground (A4) is reference
Assignment (speed / process / mode dependent) can
0...7400 rpm *
be changed via Service Software or Modbus protocol
Ground (A4) is reference
0...100 % *
Termination resistors recommended
Internally connected to power - and cable shield
®
Service Software or through Modbus protocol.
User Manual for BFS-i10
www.levitronix.com
® Service Software and a PC.
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