Siemens SIMATIC ET 200S Operating Instructions Manual page 103

Notes on the Control Bits
Table 2- 26 Notes on the Control Bits
Control bits Notes
CTRL_SYN You use this bit to enable synchronization.
EXTF_ACK Error acknowledgment
The error bits must be acknowledged with the EXTF_ACK control bit after the cause is removed.
LOAD_PREPARE Load counter preparatory
The value from bytes 0 to 3 is applied as the load value.
LOAD_VAL The value from bytes 0 to 3 is loaded directly as the new count value.
RES_STS Start resetting of status bit
The status bits are reset through the acknowledgment process between the RES_STS bit and the
RES_STS_A bit.
SW_GATE The SW gate is opened/closed via the control interface with the SW_GATE bit.
Notes on the Feedback Bits
Table 2- 27 Notes on the Feedback Bits
Feedback bits Notes
ERR_24V Short circuit of the encoder supply
The error bit must be acknowledged by the EXTF_ACK control bit.
Diagnostic message if assigned.
ERR_LOAD Load function error
The LOAD_VAL, LOAD_PREPARE, CMP_VAL1, CMP_VAL2, and C_DOPARAM bits cannot be set
simultaneously during transfer. This results in setting the ERR_LOAD status bit, similar to loading an
incorrect value (which is not accepted).
ERR_PARA Parameter assignment error ERR_PARA
RES_STS_A Resetting of status bits active
STS_C_DN Down direction status
STS_C_UP Up direction status
STS_DI DI status
The status of the DI is indicated in all modes with the STS_DI bit in the feedback interface.
STS_GATE Internal gate status: Counting
STS_LOAD Load function is running
STS_ND Zero-crossing in the count range when counting without a main counting direction. The bit must be reset
by the RES_STS control bit.
STS_OFLW High counting limit violated
STS_UFLW Low counting limit violated
Both bits must be reset.
STS_SYN Synchronization status:
After successful synchronization, the STS_SYN bit is set. It must be reset by the RES_STS control bit.
Technological Functions
Operating Instructions, 06/2010, A5E00124867-07
1Count24V
2.9 Position feedback
103