Yaskawa MEMOCON GL120 - Manual (Page 233)

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4.4 Communications Modules
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Item Specifications
MECHATROLINK Port
S ifi i
Topology Bus
Specifications
Media Access Control
Method
Multi-drop (1: n communications)
Media (Transmission
Media)
Shielded twisted-pair cable (120 Ω)
Protocol MECHATROLINK
Synchronization Frame synchronization
Communications Format Conforms to HDLC
Baud Rate 4 Mbps
Transmission Distance 200 m max.
No. of I/O Modules 30 max.
No. of I/O Points/Stations
(Input Points + Output
Points)
128 input points, 128 output points
Registers: 16 points each
Max. No. of Allocated
Points (For one
Distributed I/O Driver
Module)
1) 480 input points,512 output points
Registers: 16 points each
2) Two input registers are used to
monitor distributed I/O status.
Refresh Time The refresh time depends on the
number of slave stations as follows:
15 or less:
2 ms
16 or more: 4 ms
(Baud rate: 4 Mbps)
Watchdog Timer 45 ms
Communications are stopped when a
timeout occurs.
Caution The VINUS I/O System can be set to a redundant check mode for input data. When “Recheck
Verification” is set, data is rechecked in bit units to detect transmission errors. For this reason,
signals that are ON for only one refresh period will not be refreshed and data transmission
errors may occur for short signals.
4. Using Distributed I/O Driver Modules
1) Number of Modules
a) A Distributed I/O Driver Module runs communications with VINUS I/O System de-
vices using I/O references such as input relays, output coils, input registers and out-
put registers. For this reason, I/O allocation is necessary for the slot to which the Dis-
tributed I/O Driver Module is mounted.
b) The maximum numbers of points that can be allocated for each Distributed I/O Driver
module are as follows. Input references and output references can be allocated to-
gether.
Input references: Digital input points + register input points ≤ 480 points
(One register is 16 points)
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