Fieldbus Controller 750-841 • 39
Hardware
addition, a file system is implemented that allows you to store custom HTML pages in the controller using FTP download.
3.1.2 Hardware
3.1.2.1 View
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ETHERNET |
01 |
02 |
status |
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voltage supply |
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LINK |
A |
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-power jumper contacts |
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fieldbus |
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B |
C |
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MS |
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-system |
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connection |
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D |
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NS |
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data contacts |
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RJ 45 |
24V |
0V |
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TxD/RxD |
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supply |
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24V |
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I/O |
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0V |
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+ |
+ |
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USR |
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supply via |
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power jumper contacts |
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24V |
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750-841 |
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0V |
flap open
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power jumper contacts |
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configuration and |
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mode switch |
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programming interface |
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Fig. 3-1: Fieldbus controller ETHERNET TCP/IP |
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g084100e |
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The Fieldbus Controller consists of:
•Device supply with internal system supply module for the system supply as well as power jumper contacts for the field supply via assembled I/O modules
•Fieldbus interface with the bus connection
•Display Elements (LED's) for operation status, diagnostics, and communication status
•Configuration and programming interface port
•Operating mode switch
•Electronics for communication with the I/O modules (internal bus) and the fieldbus interface
WAGO-I/O-SYSTEM 750 ETHERNET TCP/IP
40 • Fieldbus Controller 750-841
Hardware
3.1.2.2 Device Supply
The PFC is powered via terminal blocks with CAGE CLAMP® connections. The Device Supply generates the necessary voltages to power the electronics of the controller and the internal electronics of the connected I/O modules.
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1 |
5 |
FiELDBUSINTERFACE |
ELECTRONIC |
2 |
6 |
4 |
8 |
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3 |
7 |
750-841
Fig. 3-2: Device supply
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24 V |
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DC |
I/O |
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24 V /0 V |
10 nF |
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MODULES |
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DC |
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0 V |
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24 V |
24 V |
FiELDBUS INTERFACE |
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ELECTRONIC |
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0 V |
0 V |
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10 nF |
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G084101e
The internal electronics of the controller and I/O modules are electrically isolated from the field-side power connections and field devices by the use of DC/DC converters and optocouplers
WAGO-I/O-SYSTEM 750 ETHERNET TCP/IP
Fieldbus Controller 750-841 • 41
Hardware
3.1.2.3 Fieldbus Connection
Connection to the fieldbus is by a RJ45 connector. The RJ45 socket on the fieldbus controller is wired per the 100BaseTX standard. The specification for the connecting cable is a twisted pair cable of Category 5. Cables of type S- UTP (Screened-Unshielded Twisted Pair) and STP (Shielded Twisted Pair) with a maximum segment length of 100 meters may be used.
The RJ45 socket is physically lowered for the controller to fit in an 80 mm high switch box once connected.
The electrical isolation between the fieldbus system and the electronics is achieved by DC/DC converters and optocouplers in the fieldbus interface.
Contact |
Signal |
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1 |
TD + |
Transmit + |
2 |
TD - |
Transmit - |
3 |
RD + |
Receive + |
4 |
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free |
5 |
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free |
6 |
RD - |
Receive - |
7 |
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free |
8 |
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free |
Fig. 3-3: RJ45-Connector and RJ45 Connector Configuration
3.1.2.4 Display Elements
The operating condition of the controller or the node is displayed with the help of illuminated indicators in the form of light-emitting diodes (LEDs).
The LED information is routed to the top of the case by light fibres. In some cases, these are multi-colored (red/green or red/green/orange).
ETHERNET 01 |
02 |
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ETHERNET 01 |
02 |
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LINK |
A |
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C |
LINK |
A |
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C |
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C |
A |
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MS |
B |
A |
MS |
B |
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D |
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D |
B |
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NS |
24V |
0V |
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NS |
24V |
0V |
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TxD/RxD |
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TxD/RxD |
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I/O |
+ |
+ |
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I/O |
+ |
+ |
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USR |
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USR |
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Abb. 3-1: Display Elements 750-841 |
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g084102x |
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WAGO-I/O-SYSTEM 750 ETHERNET TCP/IP
42 • Fieldbus Controller 750-841
Hardware
LED |
Color |
Meaning |
LINK |
green |
Link to a physical network exists |
MS |
red/green |
The ‚MS‘-LED indicates the state of the node (Module State) |
NS |
red/green |
The ‚NS‘-LED indicates the state of the network (Network State) |
TxD/RxD |
green |
Data exchange taking place |
IO |
red /green |
The 'I/O'-LED indicates the operation of the node and signals faults |
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/ orange |
encountered |
USR |
red /green |
The 'USR' LED can be controlled by a user program in a controller |
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/ orange |
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A |
green |
Status of the operating voltage – system |
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B or C |
green |
Status of the operating voltage – power jumper contacts |
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(LED position is manufacturing dependent) |
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3.1.2.5 Configuration and Programming Interface
The Configuration and Programming Interface port is located behind a cover flap. This communications port can be use with WAGO-I/O-CHECK and WAGO-I/O-PRO CAA, as well as for firmware downloading.
Configuration and programming interface
Fig. 3-2: Configuration Interface |
g01xx07e |
A WAGO 750-920 Communication Cable is used to connect the 4 pin male header and with a PC’s 9-pin RS232 interface.
WAGO-I/O-SYSTEM 750 ETHERNET TCP/IP