ElmoMC SimplIQ Digital Servo Drives-Bell Command Reference - Manual (Page 171)

TM - System Time
Purpose:
Reads and writes the system time, in microseconds. SimplIQ drives have a 32-bit
microsecond counter. In the absence of CAN SYNC and TSTAMP signals, the
microsecond counter runs freely, completing a cycle approximately once every 71.5
minutes. The CAN SYNC and TSTAMP sequence synchronize this counter to the
microsecond counter of the network master (refer to the
SimplIQ for Steppers CAN
Implementation Manual).
The BT command uses the TM variable to coordinate the start of motion. The tdif( )
function uses TM to calculate time differences.
Notes:
When CAN communication is used, setting or updating the system counter by
the user may upset the synchronization with the CAN network master.
The tick system function also reads the system time of the SimplIQ , drive, but its
value differs from the TM command value.
Attributes: Type: Command/Parameter, Integer
Source: Program, RS-232, CANopen
Restrictions: None
Default value: None,
Volatile
Unit modes: All
Activation: Immediate
SimplIQ: Similar
Examples:
QP[1023]=TM
Read TM into a software variable (here, QP[1023] is used as
general storage, not as motion reference).
tdif( QP[1023] ) Return the time elapsed since TM was sampled into QP[1023].
TM=0 Reset system time to zero.
The time returned by this command may jump due to a CAN master update
(refer to the Elmo CANopen Implementation Guide).
See also:
BT
SimplIQ Programming and Language Guide
SimplIQ for Steppers Command Reference Manual Alphabetical Listing
MAN-STECR (Ver. 1.1)
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