CMC electronic MAI085MB - Manual (Page 11)

mAI085-MB Actuator Interface Technical Manual /7
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 CMC INDUSTRIAL ELECTRONICS LTD
3.2 Optional Extended Data Network
Host Computer
or PLC
SV
OL
IDL
POS
FLT
MOV
OPN
CLS
EMP
PV
OPEN CLOSE CLEAR SET
SCAN
CMC INDUSTRIAL ELECTRONICS
ACTUATOR INTERFACE
24VDC
1.25A
Controller
1 - 30
4 conductor
communications
cable RS-485
Modbus RTU
RS-232
Controller
61 - 90
Controller
31-60
Controller
91 - 100
RS-485
repeater
Phoenix
Contact
2744429
RS-485
repeater
Phoenix
Contact
2744429
RS-485
repeater
Phoenix
Contact
2744429
Figure 4 - Extended Data Network
The interface can accommodate up to 100 actuator controllers if RS485 repeaters are used. A
typical repeater is the Phoenix Contact Part No. 2744429 optical isolated repeater. Up to 30
controllers can be on a single network segment (31 for the end of line). Using repeaters, a
linear network as shown above, or various forms of star or tee networks can be deployed as
required. The start of a branch on either a star or tee network must always begin with a
repeater.
A network expansion RS232 port is also provided. This port can connect directly to repeaters or
fiber-optic cable drivers. Controllers can be connected to both the standard RS485 port and the
expansion RS232 port. The port is designated J1 and is a female DB9 connector. It is wired
DTE.