Siemens SIMATIC TDC System Manual page 152

Communication modules
6.8 CP53M0 coupling module
Status displays for communication
Table 6- 36
The brightness of the LED indicates the intensity of periodic data traffic.
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152
Status and fault displays of coupling module CP53M0
LED display
H3 Off Master mode:
CP53M0 is not transmitting a startup frame to X1/2
Slave mode:
CP53M0 is not receiving a startup frame via X1/X2
On Master mode:
CP53M0 is transmitting startup frames to X1/2
Slave mode:
CP53M0 is receiving startup frames via X1/X2
H4 Off Master mode:
No acknowledgment of data access from the slave at X1/X2
Slave mode:
No acknowledgment of data access at X1/X2
Glowing Master mode:
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Acknowledgment of data access from the slave at X1/X2
Slave mode: Acknowledgment of data access at X1/X2
H5 Off Master mode: CP53M0 is transmitting startup frames at X3/4
Slave mode: No function
On Master mode: CP53M0 is transmitting startup frames at X3/4
Slave mode: No function
H6 Off Master mode: No acknowledgement of data access from the slave at
X3/X4
Slave mode:
No function
Glowing Master mode:
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Acknowledgment of data access from the slave at X1/X2
Slave mode:
No function
H7 Off Receiver, FOC interface X1/X2 has no valid receive signals
On Receiver, FOC interface X1/X2 has a valid receive signal
H8 Off Master mode:
Receiver FOC interface X3/X4 has no valid receive signal
Slave mode:
No function
On Master mode:
Receiver FOC interface X3/X4 has valid receive signal
Slave mode:
No function
State
SIMATIC TDC hardware
System Manual, 12/2013, A5E01114865-07