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3. SPECIFICATIONS
MELSEC-A
3.2
Performance Specifications
3.2.1
Transmission specifications
Table
3.2
Transmission Specifications
Specifications
interface
Conform to RS-232C
Conform to RS-422
I
Dedicated protocol
/
Half-duplex communications system
*I
Transmission method
RS-232C
Synchronous system
Transmission system
I
RS-422
Asynchronous system
300. 600, 1200, 2400, 4800. 9600, 19200 BPS (switch selected)
No-protooollbidirectional
Start bit
Full-/half-duplex (buffer memory set-
ting)
Dedicated protocol
Data bit
Half-duplex communications system *1
Data format
Parity bit
Stop bit
No-protocollbidirectional
Full-duplex communications system
A c c e s s
cycle
1 or none
1 o r 2
Each request is processed in the END processing of the sequence program
Therefore,
access
cycie is 1
scan
time.
Selectable
E r r o r
detection
Parity check present (odd1even)labsent
Sum check presentlabsent
Present (RS-232C only)
DTRIDSR (ERIDR) control
X ONIOFF (DClIDC3) control
System configuration (External
device: PC CPUl
Absent
Dedicated protocol
Transmission distance
1 : 1 , 1 : n , m : n * 2
No-protocol
Up t o 15 m (49.2 ft) for RS-232C
Up to 500 m (1640.5 fl) for RS-422
1 : 1 , 1 : n * 2
Current consumption
Number of occupying 110s
5 VDC, 1.4 A
32 ' 3
Bidirectional
Weight
1 : l
Recommended cable (for RS-422)
RS-422
SPEV(S6)- MPC
-
0.2 x 3P
Recommended RS-232C to RS-
422 converter
EL-LINE-M
*1: If the on-demand function is used, only full-duplex communications is available when
full-duplex communications is enabled.
*2:
'n'
for
1
:n ratio is u p t o 32. Total of 'm' and
'n'
for m:n ratio is u p t o 32.
*3: Set the special function modules to have 32 inputsloutputs when the
1 1 0
allocation is set.
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