6.3.3 Setting of status bits by the SBC function
The current through the brake can measured at brake release.
co82 ext. modules ctrl word
Bit 0 safety module current sense
Value COMBIVIS text Function
0 SM-CS-off Brakecurrentmeasurementoff;atthestateofthe
safety module (sb29) only the bits 8 & 22 are set. Bit
0, 7 & 21 are unaffected by the current measurement.
1 SM-CS-on Brake current measurement on (default)
Depending on the hardware, the number of activated brakes, the setting of co82 and the current
measurement the following bits in sb29 are set:
Single axis module
Current measurement on (co82 = 1) off (co82 = 0)
activated Brake bit in sb29 bits in sb29
Current 0 7 8 0 7 8
A
co21 bit 4=1
<0.1 A – 0 1 – 0 1
0.1 A…Imax – 0 0 – 0 1
>Imax 1 1 0 – 0 1
Table 14: Setting of status bits by the SBC function
Double axis module
Current measurement on (co82 = 1) off (co82 = 0)
activated brake(s) bit in sb29 bits in sb29
Current 0 7 8 21 22 0 7 8 21 22
A
co21 bit 4=1
<0.1 A – 0 1 – – – 0 1 0 1
0.1 A…Imax – 0 0 – – – 0 1 0 1
>Imax 1 1 0 – – – 0 1 0 1
B
co21(B) bit 4=1
<0.1 A – – – 0 1 – 0 1 0 1
0.1 A…Imax – – – 0 0 – 0 1 0 1
>Imax 1 – – 1 0 – 0 1 0 1
Table 15: Setting of status bits by the SBC function
„–“ in the table means, the respective bit is not affected by the function.
The control of the brake is reset to not released and the status LED is set to red when there is an error
caused by the current measurement.
Attention
Pay attention to response time
Since the current rise is slowly at high inductances of the brakes, the
error response time to a fault current is max. 100 ms.
28
FUNCTIONAL DESCRIPTIONS
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