NORD Drivesystems BU0050 - Manual (Page 49)

1.7 USS - Master- Telegram times
BU 0050 GB-3111 Subject to technical amendments 49
1.7 Master Telegram Times
The telegram times to be monitored depend on the currently valid baud rate and the telegram length.
For the data format: 8E1, the following running times apply:
Baud
rate
PPO type Telegram
Bytes
Start pause
time
[msec]
Minimum total
run time
[msec]
Maximum run
time
[msec]
Response delay
time
[msec]
4800 PPO0 14 4,583 32,083 48,1 4,583
4800 PPO1 16 4,583 36,667 55 4,583
4800 PPO2 20 4,583 45,833 68,8 4,583
4800 PPO3 8 4,583 18,333 27,5 4,583
4800 PPO4 12 4,583 27,5 41,3 4,583
9600 PPO0 14 2,292 16,042 24,1 2,292
9600 PPO1 16 2,292 18,333 27,5 2,292
9600 PPO2 20 2,292 22,917 34,4 2,292
9600 PPO3 8 2,292 9,167 13,8 2,292
9600 PPO4 12 2,292 13,75 20,6 2,292
19200 PPO0 14 1,146 8,021 12 1,146
19200 PPO1 16 1,146 9,167 13,8 1,146
19200 PPO2 20 1,146 11,458 17,2 1,146
19200 PPO3 8 1,146 4,583 6,9 1,146
19200 PPO4 12 1,146 6,875 10,3 1,146
38400 PPO0 14 0,573 4,01 6 0,573
38400 PPO1 16 0,573 4,583 6,9 0,573
38400 PPO2 20 0,573 5,729 8,6 0,573
38400 PPO3 8 0,573 2,292 3,4 0,573
38400 PPO4 12 0,573 3,438 5,2 0,573
The start pause time and the typical response delay time are determined by the transfer time for two bytes of
data. The maximum response time provided by the telegram is 20msec.
The total run time in the table is the consecutive telegram run time, i.e. the stop bit of the last character
immediately follows the start character of the next character. However, in practice there are time delays
between the bytes of a telegram. Therefore the factor 1.5 is used for the maximum telegram run time.
Maximum total run time = 1-5 * consecutive telegram run time
The interface driver software must check or maintain compliance with the following telegram parameters and
trigger an error if they are repeatedly overshot:

Telegram length details of the received telegram (LGE)

Telegram format (start character / STX, check-sum / BCC)

Character format (parity, start and stop bit)

Total run time of the slave response
Response delay time (typical transfer duration for 2 bytes, max 20 msec)