Siemens SIMATIC ET 200SP Manual page 59

ChannelLEDs
The A, B, N and DIm LEDs indicate the current level of the associated signals. The LEDs of
the digital outputs DQm indicate the desired state.
The LEDs UP and DN indicate the logical counting direction.
The flashing frequency of the channel LEDs is limited to ca. 12 Hz. If higher frequencies are
present, the channel LEDs will flash at 12 Hz instead of indicating the current status.
Table 5- 3 A/B/N/DIm/DQm status displays
A/B/N/DIm/DQm LEDs
Off
On
Table 5- 4 Status displays UP/DN
LEDs
UP
Off
On
Off
Technology Module TM Count 1x24V (6ES7138-6AA00-0BA0)
Manual, 02/2017, A5E33002339-AB
Counter input / digital input / digital output at 0 level
Counter input / digital input / digital output at 1 level
DN
No count pulse has been detected for the last 0.5 s.
Off
The last count pulse has incremented the counter and took place no more
than 0.5 s ago.
Off
The last count pulse has decremented the counter and took place no more
than 0.5 s ago.
On
Interrupts/diagnostic messages
5.1 Status and error displays
Meaning
Meaning
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