Port J26 Confi Guration; Controller Network Connections - Carel pCO5+ User Manual

ENG
3.2 Port J26 confi guration
Compared to the pCO5, pCO5+ controllers are provided with 4
microswitches for confi guring serial port J26 (fi gure):
•
microswitches all down: port J26 set with Fieldbus hardware;
•
microswitches all up: port J26 set with BMS hardware*.
Factory confi guration: Fieldbus port.
(*) At the software level, in the 1Tool programming environment the serial
port is still the Fieldbus2.
BMS
FieldBus

3.3 Controller network connections

The pCO5+ comes with three kinds of serial ports: pLAN, Fieldbus, BMS.
The RS485 Fieldbus serial port is designed with Master-type hardware,
while the RS485 BMS serial port has Slave-type hardware. The protocols
used on the RS485 Fieldbus port are, due to the nature of the port, Master
protocols (CAREL Master or Modbus RTU Master), although in special
cases Slave protocols can be used (CAREL Slave or Modbus RTU Slave),
adopting the necessary measures. Likewise, Slave protocols are applied
on the RS485 BMS port, although under certain conditions Master
protocols can also be used.
Note: The pLAN network is multi-master, meaning that each
controller can work as Master or Slave at the same time.
MASTER - SLAVE network
J11 pLAN J11 pLAN
pCO5+ pCO5+
J25 BMS2 J26 FBus2
MASTER
PC
MASTER
J11 pLAN
pCO5+
pLAN network
J11 pLAN
J11 pLAN
pCO5+ pCO5+
J25 BMS2 J26 FBus2
MASTER/SLAVE
pCO5plus +0300020EN rel. 1.2 - 07.11.2013
J26
1 2 3 4
FieldBus
4 3 2 1
BMS
J26
Fig. 3.b
J11 pLAN
pCO5+
J25 BMS2 J26 FBus2 J25 BMS2 J26 FBus2
SLAVE SLAVE
Fig. 3.c
J11 pLAN
pCO5+
J25 BMS2 J26 FBus2 J25 BMS2 J26 FBus2
SLAVE SLAVE
Fig. 3.d
J11 pLAN
pCO5+
J25 BMS2 J26 FBus2 J25 BMS2 J26 FBus2
MASTER/SLAVE MASTER/SLAVE
Fig. 3.e
Important warnings:
•
By applying the appropriate impedance, a serial port with Master
(FBus) hardware supplies the network with the bias voltage required to
run all the connected devices, i.e. the master itself and its slaves.
•
Conversely, serial ports with slave hardware (BMS) do not provide bias
voltage, so it is always advisable to connect at least one device with
master hardware (FBus) to the network so that it is correctly biased.
•
However, no more than two devices with master hardware (FBus) can
be connected to the same network, otherwise the network's total
bias impedance becomes too small and incapable of supplying the
required voltage to the RS485 network.
•
We recommend connecting the serial probes or other fi eld devices to
an optically-isolated version of the Fieldbus serial port or to serial port
TWO – Fieldbus 1 to exploit the fi ltering properties of optical isolation.
Special cases
•
In networks consisting only of slave HW devices, no more than 207
devices can be connected. The max. length allowed for the network
is 100 m.
DO NOT connect the 120Ω, 1/4W terminating resistors to the fi rst
and last devices;
•
In networks consisting only of Master HW devices, no more than 2
devices can be connected. The max. length allowed for the network
is 1000 m. If the network is longer than 100 m, apply the 120Ω, 1/4W
terminating resistors to the fi rst and last devices in the network;
•
connect the computer to a network with no more than 1 master HW
device or no more than 207 slave HW devices.
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