ABB REF 54 Series, Technical Reference Manual, General

Page: 74 / 132

74
1MRS750527-MUM Feeder Terminal
Technical Reference Manual, General
REF 54_
1) The change of Baud rate parameter value forces an automatic update of the Next character timeout
parameter value to 1,5 character times. If the timeout value is lower then 2ms then it is disabled (set
to 0 - not in use).
2) The change of Baud rate parameter value forces an automatic update of End Of Frame timeout
parameter value to 3,5 character times.
3) The change of Parity parameter value forces an automatic update of the number of stop bits to 1, with
parity used, and to 2 for parity none.
4) The counters are 16 bit cyclical counters, after reaching 0xFFFF (65535) next increment changes the
value back to 0x0000. The default setting is reset to 0 at system start.
5.1.13.8. Parallel communication support
When SPA is used, the rear side communication is not stopped when the front
connector is “active”. This enables for example uploading the disturbance records
without affecting the communication to upper level.
Moreover, if LON is selected as a communication protocol and the front connector
is “active”, transparent SPA write commands are not inhibited via the LON bus.
1
5.1.13.9. System structure
The system very often resembles the system in the following figure. The protection,
control or alarm functions are implemented by using REF 54_ feeder terminals,
SPACOM units or other SPA bus devices (devices connected to the system via the
SPA bus). Generator or motor feeders are protected and controlled with REF 54_
feeder terminals. LON devices made by other manufacturers or other ABB
companies may be used for various DI, AI and DO functions. MicroSCADA is used
for remote control.
Number of stop bits
0...2
3) 1
Next character
timeout 0=Not in use,
2...65535 [ms]
1)
1000
(ASCII)
0 (RTU)
End Of Frame timeout 2....65535 [ms]
2)
1000
(ASCII)
2 (RTU)
Parity
0...2
3)
[0=None
1=Odd
2=Even]
2
Number of data bits 5...8 7 (ASCII)
8 (RTU)
Frame error counter 0...65535 0
Frame error counter
4)
Parity error counter 0...65535 0
Parity error counter
4)
Overrun error counter 0...65535 0
Overrun error counter
4)
Protocol mapping
diagnostic parameter Protocol mapping name
Protocol mapping
diagnostic parameter Modbus protocol mapping file
Parameter Value Default Explanation
1. Parallel communication is restricted in releases prior to Release 2.0, refer to Section
“Release 2.0” on page 107.