F 037 300 069 (2013.05.21)
24
Temperature drift at standstill: ±0.025 mm/C
1
, any temperature drift will be automatically
compensated after a movement of at least 10mm (after automatic calibration, see Section 5.1).
Maximum count frequency 410 kHz
Resolution 1024 pulses / cm, as per Figure 19.
The count frequency of the A and B output is 1024 (counts / cm) x speed (cm / s).
It is advisable to use a counter module at customer side with an input frequency range twice
the expected maximum frequency calculated as above.
If the RS422 output cannot be used directly, a converter card can be used to convert the 1024
pulses/cm to for example an analog 4-20mA, 0-20mA or 0-10V signal, see Section 7.4.
Displacements due to mechanical strain and temperature elongation of the piston rod are not
measured by the CIMS measuring system.
5.2.2. RS485 DIAGNOSTIC OUTPUT
The CIMS Mk IV provides a RS485 diagnostic output using the MODBUS protocol. Via a USB
converter, like the one described in Section 7.4, the CIMS can be connected to a PC to read out
information about the CIMS Mk IV, like the sensor identification number, the production date,
sensor status, error codes and the current position (since last power up).
A special software program is available to read out the diagnostic information with a PC, see
www.boschrexroth.com/lhc
. The diagnostic output can also be connected directly to for example a
PLC. A detailed description about the MODBUS implementation can be found in Appendix C.
1
At a temperature change > 60C and without movement of the cylinder rod in some exceptional situations
the temperature drift might be higher.
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