Siemens SIMATIC S7-1500 Manual page 70

Explanations
Feedback bit/value Explanations
CAPTURED_VALUE This DINT value indicates the last acquired Capture value.
The following external signals can trigger the Capture function:
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•
The "Frequency of Capture function" parameter specifies whether the function is executed at each
configured edge or only once after each enable.
COUNT_VALUE This DINT value indicates the current counter value or position value.
If you use an SSI absolute encoder with a position value length up to 31 bits, the position value is
treated as unsigned and as a positive value and can assume values between 0 and 2
you use an SSI absolute encoder with a position value length of 32 bits, the MSB of the position
value corresponds to the sign and the position value can assume values between –2147483648
and 2147483647. If you use a 32-bit position value for the comparison function, the position value is
interpreted as DINT.
ENC_ERROR This bit indicates that one of the following errors has occurred at the encoder signals (retentive) for
the respective technology module:
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•
•
If you have enabled the diagnostic interrupts, the respective diagnostic interrupt is triggered in the
event of encoder signal errors. For information on the meaning of the diagnostic interrupts, refer to
the manual for the respective technology module.
The bit is reset once you have acknowledged the error with RES_ERROR .
EVENT_CAP This bit indicates that a Capture event has occurred and a counter value has been saved in
CAPTURED_VALUE . You reset the status by resetting EN_CAPTURE .
EVENT_CMP0 This bit indicates the saved status that a comparison event (status change) has occurred for the
digital output DQ0 based on the selected comparison condition. You reset the status by acknowl-
edgment with RES_EVENT.
If the counter value is set to the start value in counting mode, EVENT_CMP0 is not set.
EVENT_CMP1 This bit indicates the saved status that a comparison event (status change) has occurred for the
digital output DQ1 based on the selected comparison condition. You reset the status by acknowl-
edgment with RES_EVENT.
If the counter value is set to the start value in counting mode, EVENT_CMP1 is not set.
EVENT_OFLW This bit indicates the saved status that the counter value had an overflow. You reset the status by
acknowledgment with RES_EVENT.
EVENT_SYNC When an incremental or pulse encoder is used, this bit indicates the saved status that the counter
was loaded with the start value by an external reference signal (synchronization). You reset the
status by resetting EN_SYNC_UP or EN_SYNC_DN .
EVENT_UFLW This bit indicates the saved status that the counter value had an underflow. You reset the status by
acknowledgment with RES_EVENT.
EVENT_ZERO This bit indicates the saved status that the counter value or position value had a zero crossing. You
reset the status by acknowledgment with RES_EVENT.
When the "Zero crossing" hardware interrupt is enabled, for system-related reasons it can also be
triggered if "0" is outside the configured value range.
Technology module TM PosInput 2 (6ES7551-1AB00-0AB0)
Manual, 06/2018, A5E03982218-AB
Rising or falling edge of a digital input
Both edges of a digital input
Invalid transition of A/B signals (with incremental encoder)
RS422/TTL error
SSI encoder error or SSI frame error (with SSI absolute encoder)
Configuring/address space
4.3 Manual operation (without technology object)
-1. If
(MSB-LSB+1)
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