ProSoft Technology MVI56-PDPS - Manual (Page 52)

MVI56-PDPS ♦ ControlLogix Platform Diagnostics and Troubleshooting
Profibus DP Slave Communication Module
Page 52 of 88 ProSoft Technology, Inc.
April 22, 2008
Response Time Monitoring
The 'DP_Control' state serves response time monitoring of the DP master
(Master_Add). The set monitoring times results from multiplying both watchdog
factors and multiplying the result with the momentarily valid time base (1 ms or
10 ms):
ƒ
TWD = (1 ms or 10 ms) * WD_Fact_1 * WD_Fact_2 (See byte 7 of the
parameter setting telegram.)
The user can load the two watchdog factors (WD_Fact_1, and WD_Fact_2) and
the time base that represents a measurement for the monitoring time via the
'Set_Param telegram' with any value between 1 and 255.
EXCEPTION: The WD_Fact_1=WD_Fact_2=1 setting is not permissible. The
circuit does not check this setting.
Monitoring times between 2 ms and 650 s - independent of the baud rate - can
be implemented with the permissible watchdog factors. If the monitoring time
runs out, the SPC3 goes again to 'Baud_Control,' and the SPC3 generates the
'WD_DP_Control_Timeout-Interrupt'. In addition, the DP_State machine is reset,
that is, generates the reset states of the buffer management.
If another master accepts SPC3, then there is either a switch to 'Baud_Control"
(WD_On = 0), or there is a delay in 'DP_Control' (WD_On = 1), depending on the
enabled response time monitoring (WD_On = 0).
Status Register [1]
SPC3 ASIC slave status information provided to the master.
Baud rate:
The baud rates SPC3 found Bits
0 to 3
0000 = 12 MBaud
0001 = 6 MBaud
0010 = 3 MBaud
0011 = 1.5 MBaud
0100 = 500 kBaud
0101 = 187.5 kBaud
0110 = 93.75 kBaud
0111 = 45.45 kBaud
1000 = 19.2 kBaud
1001 = 9.6 kBaud
Rest = Not possible
SPC3-Release:
Release no. for SPC3 Bits
4 to 7
0000 = Release 0
Rest = Not possible
Diagnostic State
ƒ
0 = Normal Operation or not in data exchange with Status Register [0] Bit
0x20 set.