Specifications

54
9. Control by MEMOBUS Communication
Reference selection b1-01
Operation method selection b1-02
Station address H5-01
Transmission speed selection H5-02
Transmission parity selection H5-03
Stopping method after transmission error H5-04
Transmission error detection selection H5-05
Send wait time H5-06
RTS control ON/OFF H5-07
MEMOBUS communication error code U1-39
The Varispeed G7 can perform serial communication
through the programmable controller (hereafter referred
to as PLC) and the MEMOBUS communication.
MEMOBUS is composed of one master (PLC) and 1 to 31
slaves (Varispeed G7). In the signal transmission (serial
communication) between the master and the slave (s), the
master always starts signal transmission and the slaves
respond to it.
The master performs signal transmission simultaneously
with one slave. Therefore, set address number for each
slave in advance, and the master can specify the number
for signal transmission. The slave that receives the
command from the master executes the specified function,
and returns a response to the master.
〔Communication specifications〕
・Interface：RS-485/422
・
Synchronization：Non-synchronous (start stop synchronization)
・Communication parameter：
・Can be selected from baud rate 2400, 4800, 9600 or
19200 bps (constant H5-02).
・Data length 8-bit fixed
・Parity with/without parity, odd/even parity
selectable (constant H5-03)
・Stop bit 1 bit fixed
・Protocol：MEMOBUS or equivalent (RTU mode only)
・Max. connection：31 units (when RS-485 is used)
〔Data that can be transmitted/received on-line〕
Data that can be transmitted/received on-line are the run
command, frequency reference, fault, inverter status,
constant setting/reference.
（1）Operation mode selection (b1-01, b1-02)
Select the run command and frequency reference input
method in constants b1-01 and b1-02, respectively. To
provide a run command and frequency reference by
communication, set these constants to setting 2. Also
without regard to this selection, monitoring of running
status, constant setting/reference, fault reset and multi-
function input command from the PLC are enabled. The
multi-function input command becomes OR with the
command input from control circuit terminals S3 to S12.
（2）MEMOBUS frequency reference unit (o1-03)
The frequency reference units from the PLC and in the
frequency reference and output frequency monitors (by
communication) are selected.
（3）MEMOBUS slave address (H5-01)
The slave address number is set. It is necessary to set
the address number so that it will not overlap with the
address number of another slave connected on the
same transmission line.
Note: To change the values set in constant H5-01 to H5-07 and enable
new settings, it is necessary to turn OFF the power supply, and
then turn it ON again.
（4）MEMOBUS communication error code (U1-39)
If an error occurs in the MEMOBUS communication,
the error contents can be displayed on the digital
operator.
1 : CRC Error
1 : Improper Data Length
Not Used
1 : Parity Error
1 : Overrun Error
1 : Framing Error
1 : Time Over
Not Used
Memobus Error Code
U1-39＝01111011
Cont
,
d