Siemens SIMATIC ET 200SP Manual page 119

Channel status LEDs
The LEDs for DI digital inputs and DQ digital outputs indicate the digital state of the
associated channel signals.
The LEDs of the digital outputs DQ indicate the desired state.
● DIn.0 digital inputs
– 0.0 - Channel 0 input
– 1.0 - Channel 1 input
● DQn.A and DQn.B digital outputs
– 0.A and 0.B - Channel 0 outputs
– 1.A and 1.B - Channel 1 outputs
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 actual
status.
Table 7- 3
Technology module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
Manual, 09/2015, A5E35061186-AA
Status displays DI digital inputs and DQ digital outputs
LED status
Digital input / digital output is at 0 level.
Off
Digital input / digital output is at 1 level.
On green
Interrupts/diagnostic messages
7.1 Status and error displays
Meaning
119