Siemens SIMATIC ET 200SP Manual page 90

Modes and Functions
3.14 Function: Direct control of DQ digital outputs
TM_CTRL_DQ SET_DQA
0 0
0 1
0 1
0 0
1 Don't care
Note
Setting both DQn.A and DQn.B to the 1 state not allowed
You cannot set both DQn.A and DQn.B to 1 at the same time. If SET_DQA and SET_DQB
are set high and TM_CTRL_DQ is low, only output DQn.A will go high and an error bit
ERR_DQB is set in the feedback interface. This error must be acknowledged in the control
interface by using the RES_ERROR bit.
90
States of DQ bits
SET_DQB Reaction at DQn.A
0 0
0 1
1 1
1 0
Don't care State controlled by pulse processing State controlled by pulse processing
Reaction at DQn.B
0
0
0 (ERR_DQB is set)
1
Technology module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
Manual, 09/2015, A5E35061186-AA