10/05 AWB8230-1541GB
Displayed value (selection with
PNU b089)
151
Displayed value (selection with PNU b089)
When you operate frequency inverter DF51 through the serial
interface with a fieldbus module (Modbus, CANopen,
PROFIBUS DP) or an external keypad (DEX-KEY-…), the built-in
keypad is disabled. Only the STOP key remains enabled, but can
also be disabled with parameter b087. With PNU b089 you can
select a parameter to be displayed (d001 to d007) on the built-in
keypad’s display.
Table 40: Selecting a display value in operation through the serial interface (PNU b089)
When operating through the serial interface, observe the
following:
• DF51 shows the value of d00x as selected with PNU b089 if:
– DIP switch OPE/485 is set to 485;
– the frequency inverter is connected through the serial
interface when the supply voltage is connected (POWER).
• During operation through the serial interface, the received fault
signals (E xx, ) are displayed regardless of the setting in
PNU b089. You can acknowledge the fault signal with the STOP
key or the Reset function (RST, a section “Resetting fault
signals (RST)”, page 122).
• You can disable the Stop key with PNU b087.
The network protocol
Transmission
Transmission takes place in RTU mode. The message contains no
header or end characters and conforms to the following syntax:
The data is transmitted in binary code. The end of the telegram is
recognized by a pause in transmission of at least 3.5 characters
(latency).
The data transmission between a PLC and the frequency inverter
(DF51) has the following pattern:
• Request – the PLC sends a protocol (Modbus) frame to the
frequency inverter.
• Response – after the cyclic waiting time defined by the system
(plus the time in PNU C078), the frequency inverter responds
with a protocol (Modbus) frame to the PLC.
Value Function Description Value range
01 d001 Output frequency 0.0 – 400.0 Hz (0.1 Hz)
02 d002 Output current 0.0 – 999.9 A (0.1 A)
03 d003 Direction of rotation • F: Clockwise (forward) rotating
field
• O: STOP
• R: Anticlockwise (reverse)
rotating field
04 d004
PID feedback 0.00 – 99.99 (0.01 %)
100.0 – 999.9 (0.1 %)
1000 – 9999 (1 %)
05 d005
Status of digital inputs 1 to 5 –
06 d006 State of digital outputs 11, 12 and relay K1 –
07 d007 Scaled output frequency 0.00 – 9999 (0.01/0.1/1/10 Hz)
Figure 156:RTU mode
CRC-16: Block parity test character (cyclic redundancy check)
Slave address Task Data CRC-16
To Next Page
Loading...
