Crc Output Of The Parameter File - Mitsubishi Electric MELFA CR750 Series Instruction Manual

5 Parameters
5.1.3

CRC output of the parameter file

(1) Overview
The CRC value of the parameter file in which the parameters for Safety Monitoring Function are stored can
be calculated, and the value can be output externally by the dedicated output signal. The peripheral
instruments can detect the modification of parameters for Safety Monitoring Function by monitoring this
signal.
Please note that the software version combination of controller and RT ToolBox2 must correspond to the
"Version Combination B" for using this function
(2) Timings of calculation of CRC
The CRC for the parameter file is calculated in the following timings.
・Just after the Power-on of the controller.
・When the controller completes writing operation of the parameters, after modification of the parameters
for Safety Monitoring Function.
※ Even if the Safety Monitoring Function is disabled, the CRC is calculated and output to the dedicated
output signal.
※ When the parameters are written to the controller by means of the restore function in RT ToolBox2, the
CRC is calculated when the power is turned on in the next time. The CRC has the same value as in the case
when the written parameter file is backed-up.
(3) Dedicated output signal
The CRC for the parameters is output to the dedicated signal, SFPFCSIG. The width of output signal is
fixed to 16 bits.
For example,
・ SFPFCSIG setting: Start = 16, End = 31
・ CRC value： DB17(in the hexadecimal)
In the settings shown above, the signal is output as follows.
5-54 Safety monitoring function parameters