Specifications

Head Station STL-PB1 (Profibus DP) Profibus DP
Quick Start Guide for the MELSEC STlite Series 2 - 5
2.2.3 Display Elements
* The state of the Profibus communication is displayed by the four LEDs RUN, BF, DIA and BUS. Detailed fault messages are
indicated with a blink code. Please refer to the manual of the STL-PB1 for a detailed description of these LEDs.
Fig. 2-5: The operating condition of the head
station is signaled via LEDs.
LED Color Status Description
RUN Green ON The head station is correctly initialized.*
BF Red
ON
OFF
Blinking
The BF-LED indicates whether the communication functions via the Profibus.*
DIA Red
ON
OFF
The DIA-LED indicates an external diagnostics.*
The signaling is not supported by all devices or must be explicitly enabled for
each channel.
BUS Red
Blinking
OFF
The BUS-LED signals a projecting fault with the Profibus DP projecting of the
station.*
IO
Green ON Data cycle on the internal bus
Red
ON Hardware error of the head station
Blinking
앫 When starting: internal bus is initialized
앫 During operation: general internal bus fault
Blinking
cyclically
Fault message during internal bus reset and internal fault
Amber ON Access to the head station firmware in the Flash-EEPROM
— OFF No data cycle on the internal bus
AGreen
ON System supply is ok.
OFF System supply failed.
BGreen
ON Field supply (power jumper contacts) is ok.
OFF Field supply failed.
Tab. 2-1: Description of the LEDs of the STL-PB1
A
B