Panasonic MEWNET-F, Technical Manual

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3-3
3.2 Performance Specifications (Common to the System)
Item Specifications
Communication method Two-wire, half duplex transmission
Synchronous method Start stop synchronous system
Transmission distance Note1) 700 m (total length) per 1 port (2 paths)
Baud rate 0.5 M bps
Transmission line 2-wire cable (VCTF0.75 mm
2
x 2C (JIS) or equivalent) is used
Interface Multi-drop (RS485)
Transmission error check CRC (Cyclic Redundancy Check) method
No. of master units
per 1 CPU
Max. 4 units
No. of slave stations per
1 master unit
Max. 32 stations
Per 1 master unit
Max. 2048 points (FP2/FP3)
Max. 4096 points (FP2SH/FP10SH)
For FP3 Master unit Ver. 1.4 or older, max. 1024 poins
I/O Terminal
Board
32 points per unit (16-point input + 16-point output) or
24 points (Input: 16 Output: 8 point)
* I/O numbers are allocated from the input side.
No. of controllable I/O points No. of I/
O points for
each station
I/O Terminal
Unit
Per unit, when using a single unit: 16 points, when using expansion units: 32
points
* Number of occupied points is the same for the 8-point unit and 16-point unit.
When combining the input and output, I/O numbers are allocated from the input
side, which are 16-point input and 16-point output.
Per 1 CPU Max. 128 slots
Per 1 master unit Max. 64 slots
FP2/FP3
Slave station
system
Max. 24 slots
I/O Terminal
Board
1 slot
I/O control
No. of controllable slots No. of slots for
each
station
I/O Terminal
Unit 1 slot
* Number of slot is 1 even if a unit is added.
FP3
Master Unit, MEWNET-P/W/H Link Unit
ET-LAN Unit, Computer Communication Unit (CCU),
C-NET Link Unit, S-LINK Unit
Advanced units that occur interrupt
Units that cannot be installed
on the backplane of slave
station system
FP2
Multi-wire Link Unit, MEWNET-VE Link Unit
ET-LAN Unit, Computer Communication Unit (CCU),
Multi Communication Unit
A/D Unit, D/A Unit, RTD Unit
Advanced units that occur interrupt
Note1) The transmission distance varies according to the used cable and type of unit.
Note2) The advanced units that occur interrupt are as follows. - Interrupt unit
- High-speed counter unit and Pulse output unit can be used when setting to the mode that does not
occur interrupt.
- As there is no indication for the error that a prohibited unit is installed on FP2 A/D unit, D/A unit and
RTD unit, no error indication will be displayed, even If they are installed incorrectly.
Note3) When using a positioning unit for FP2 slave station system, and If the time taken from the start-
up to the completion of positioning operation is shorter than the scan time, flags such as the output end
flag and pulse output flag may not be read and an error may occur.The time from the start-up to the
completion of positioning operation must be longer than the scan time.