Siemens SIMATIC TI555 User Manual

Troubleshooting
7-5
TI545/TI555 System Manual
• SF/Loop Follows PLC to Program Mode — informational comment.
• PLC Fatal Error = a description, causes, and corrective actions are
listed in Section 7.3.
• PLC Non-fatal Error = a description, causes, and corrective actions are
listed in Section 7.4.
• Loop Fatal Error = status word 161 (STW161) reports the causes and
indicates the corrective actions.
• Loop Non-fatal Error = status word 162 (STW162) reports the causes
and indicates the corrective actions.
• Battery = On indicates the backup battery is switched On and good ;
Off indicates the backup battery is switched Off or bad .
• Download select switch is not user accessible and is always Off.
• Program in [RAM or ROM]; RAM if system is operating from RAM
memory; ROM if system is operating from an EEPROM (EPROM).
TI545/TI555 Operational Status
Scan = 027 milliseconds Battery = On
Key = Unlocked Download = Of f
Mode = Run Program in RAM
SF/Loop Mode = Run
SF/Loop Follows P/C to Program Mode
Fatal Error = None
Loop Fatal Error = None
Non Fatal Error = None
Loop Non Fatal Error = None
Figure 7-1 Typical AUX Function 29 Scr een

Siemens SIMATIC TI555 Specifications

General

Brand	Siemens
Model	SIMATIC TI555
Category	Controller
Language	English