Siemens SIMATIC ET 200SP Manual page 56

Interrupts/diagnostic messages
5.1 Status and error displays
Channel LEDs
The LEDs A, B, N and DIm indicate the current level of the associated signals. The LEDs of
the digital outputs DQm indicate the desired state.
The flashing frequency of the channel LEDs is limited to approximately 12 Hz. If higher
frequencies are present, the channel LEDs will flash at 12 Hz instead of indicating the
current status.
If you are using an SSI absolute encoder, the LEDs D and C light up green during the
transmission of encoder frames. The LEDs D and C are off when an error has occurred.
Table 5- 3
Table 5- 4
56
A/B/N/DIm/DQm status displays
A/B/N/DIm/DQm LEDs
Off
On
Status displays UP/DN
LEDs
UP DN
Off Off
On Off
Off On
Counter input/digital input/digital output at 0 level
Counter input/digital input/digital output at 1 level
No count pulse has been detected for the last 0.5 s.
The last count pulse incremented the counter and occurred no
more than 0.5 s ago.
The last count pulse decremented the counter and occurred no
more than 0.5 s ago.
Technology module TM PosInput 1 (6ES7138-6BA00-0BA0)
Meaning
Meaning
Manual, 04/2016, A5E33015755-AC