Yaskawa MEMOCON GL120 - Manual (Page 217)

4.4 Communications Modules
— 4-161 —
2) Performance Specifications
The following table shows the performance specifications of the Uniwire Interface Mod-
ule.
Table 4.68 Performance Specifications of Uniwire Interface Module
Items Specifications
Communications Method Interactive time-sharing multiplex
Synchronization Method Bit synchronous
Protocol Uniwire protocol
Transmission Medium Twisted pair cable (0.5 mm 2 min.)
Baud Rate Select either 14.3 kbps or 28.5 kbps
Transmission Distance At 28.5 kbps: Maximum transmission distance is 200 m.
At 14.3 kbps: Maximum transmission distance is 500 m.
Number of Stations 20 stations max. Up to 20 Address Units or One-piece Address
I/O Units can be connected.
Maximum Transmission Points 256 points. One register is 16 points.
Maximum Allocation Points
1) 272 points. One register is 16 points.
2) Sixteen input relays or an input register is used to monitor
the status of Uniwire Interface Module and Uniwire System.
Refresh Time With 256 transmission points and baud rate of 28.5 kbps, the
refresh time is approximately 26 ms.
Watchdog Timer 210 ms. Communications will be interrupted for timeout errors.
4. Using the Uniwire Interface Module
1) Number of Modules
a) A Uniwire Interface Module runs communications with Uniwire System devices using
I/O references such as input relays, output coils, input registers and output registers.
For this reason, I/O allocation is necessary for the slot to which Uniwire Interface Mod-
ule is mounted.
b) The following rules apply for I/O allocation for the Uniwire Interface Module.
(1) Either digital references such as input relays and output coils, or register refer-
ences such as input registers and output registers are allocated. You cannot allo-
cate digital references and register references mixed together.
(2) Allocation of Digital References
• Allocate input relays and output coils 16 points at a time. The maximum
272 points can be allocated as the total number of input relays and the output
coils.
• Consecutive 16 points of input relays are needed for monitoring the status of the
Uniwire Interface Module and the Uniwire System. Among the allocated input re-
lays, the leading 16 input relays are used for monitoring the status.
4