Automation
Fieldbus function modules
Lenze
3-27
8200 motec/starttec en 12/03
3
LECOM-B (RS485)
General data and operating conditions
Communication medium RS485 (LECOM-B)
Communication protocol LECOM-AB V2.0
Transfer character format 7E1: 7 Bit ASCII, 1 stop bit, 1 start bit, 1 parity bit (even)
Baud rate [bps] 1200, 2400, 4800, 9600, 19200, 38400, 57600
LECOM-B station Slave
Network topology Without repeaters: Line
With repeaters: Line or tree
Process data words (PZD) (16 bits) 2 words
Max. no. of stations Standard: 32 (= 1 bus segment) including control system
With repeaters: 90 slaves
Max. cable length per bus segment 1000 m (depending on baud rate and cable type used)
Electrical connection Screw terminals
Connection options Rigid: 1.5 mm
2
(AWG 16)
Flexible:
1.0 mm
2
(AWG 18) without wire crimp cap
0.5 mm
2
(AWG 20) with wire crimp cap without plastic crimp cap
0.5 mm
2
(AWG 20) with wire crimp cap with plastic crimp cap
DC voltage supply Internal
for the function module • External
– Only required for bus stations which are to be disconnected from
the mains, but communication with the master is to be maintained
– Required for bus devices with activated bus terminating resistor,
which are to be disconnected from the mains, but the bus system is
to remain active
– Power is being provided via a separate power supply
– +24 VDC ± 10%, max. 70 mA per function module
Isolation voltage to reference earth/PE 50 V AC
Ambient temperature Operation: –20 ... +60ºC
Transport: –25 ... +70ºC
Storage: –25 ... +60ºC
Climatic conditions Class 3K3 to EN 50178
(no condensation, average relative humidity 85%)
Note:
Two LEDs are located on the function module to indicate the communication status.
Important:
The internal or external DC supply to the "controller inhibit" terminal (X3/28) is provided
independently of the internal or external DC supply to the function module.
Tip:
The external DC supply to the function module is provided via terminals X3/59 and X3/7.
The connection diagrams above indicate the internal DC supply to the function module as an
alternative option.
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