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3.
SPECIFICATIONS
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MELSEC-A
3.2 Performance Specifications
3.2.1
TransmWon spectflCaion~
Table 3.2 Transmission Specifications
Item
SpocHications
Conform to RS232C.
Conform to
RS-422.
Interface
Dedicated protocol
Fullduplex communications 8ystem
No-protocol/bidirectional
Half-duplex communications system *1 Dedicated protocol
Full-/half-duplex (buffer
memory
setting)
No-protocoilbidirectional
Half-duplex communications system '1
RS-232C
Transmission method
RS-422
Synchronous system
Transmission system
Asynchronous system
300,600,1200, 2400,4800,9600,19200 BPS (switch selected)
Start bit
1 or2
Stop bit
Selectable
1
or
none '4
Parity bit
7
or
8
Data bit
1
Data format
.
Each request is processed in the END processing of the sequence program.
Therefore, access cycle is
1
scan time.
Parity check presont (oddleven)/absent
Sum check presenthbsent
Access cycle
Error detection
DTWDSR (EWDR) control
DCl/DC3, DC2/DC4 control
Present /Abrent (RS-232C only)
Prerent /Absent
Dedicated protocol
1:1,1:n,m:n*2
System configuration (External
device:
PC
CPU)
No-protocol
1
:
1,1
:
n.2
Bidirectional
Up to 15
m
(49.2
ft)
for RS-232C
1 :1
Up to
500
m (1640.5
n)
for RS-422
Transmission distance
Current consumption
SPEV(SB)-
MPC.
0.2
x
3p
hcommendd cable (for R-22)
630
g
(1.39 Ib)
Weight
32
*3
Number
of
occupying
1/08
5 VDC, 1.4
A
Fiecommended Rs-232C
to RS-422 converter
Rs-422
EL-LINE-M
'1: If the on-demand function is umd, onty fullduplex communications
is
available when
*2: 'n' for
1
:n ratio
is
up to
32.
Total of
'm'
and 'n' for m:n ratio is up to 32.
'3:
Set the special function modules to have 32 inputsloutputs when the 110 allocation
is
set.
'4:
Horizontal parity
full-duplex communications is enabled.
c
I
3-2
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