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3.4 Serial
Transmission
In addition to P-I/O, this drive equipment also supports serial data transmission using a transmission unit. The
TMdrive-10 can be set up to use one, the other, or both of these techniques. The serial data transmission unit
provides an interface with upstream programmable controllers (PLC units).
The serial data transmission unit provides two types of transmission: scan transmission and message
transmission, although it can be used for scan transmission only depending on the system specifications or
transmission type.
In addition, in this book, the case where drive equipment receives from external equipments, such as PLC, is
considered as "reception" or a "input", and the case where it transmits to external equipment from drive
equipment is considered as "transmission" or a "output".
(1) Scan transmission
This transmission system transmits data at specified intervals (at regular time). This system is used to input
and output the speed and sequence signals between the drive unit and PLC.
(2) Message transmission
This transmission system transmits data among specified stations at irregular time. This system is
applicable to transmission of a lot of data, such as trace-back data if a fault occurs. This transmission
corresponds by TOSLINE-S20 transmission and ISBus transmission. In TOSLINE-S20 transmission, it is
an option by system specification.
(3) Transmission unit
Unit of transmission data is called “word”. 1 word is 16 bits.
1 word of the number of scan memory word is 16 bits.
See 70 page to transmission data format.
3.4.1 Transmission Types
Depending on the scan transmission speed and the number of stations, two types of transmission systems are
available as shown in Table 3.4.1 to Table 3.4.4. An optimal transmission type suitable for the user’s application
is selected.
Table 3.4.1 Overview of TOSLINE-S20
Standard version
High speed version
Maximum number of stations
PLC station: 1 unit
Drive station: 63 units
(ASC is used.)
PLC station: 1 unit
Drive station: 4 units
Scan memory words
Maximum 1024 words
16 words send and
receive/unit
Maximum 128 words
16 words send and
receive/unit
64 stations
×
16 words
Interval: 25 ms
4 drive units
×
16 words
Interval: 2 ms
Transmission speed of scan
transmission
8 stations
×
16 words
Interval: 4 ms
2 drive units
×
16 words
Interval: 1 ms
Frame size of message
transmission
544 bytes
74 bytes
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