Siemens SIMATIC NET PROFIBUS manual Transmission Rate

Configuring Networks

Table 3-9 Constants for Calculating the Slot Time with DP Standard (redundant optical ring)

Transmission		a	b	c
rate
12 Mbps		1651	240	28
6 Mbps		951	120	24
3 Mbps		551	60	24
1.5 Mbps		351	30	24
500 Kbps		251	10	24
187.5	Kbps	171	3.75	24
93.75	Kbps	171	1.875	24
45.45	Kbps	851	0.909	24
19.2	Kbps	171	0.384	24
9.6	Kbps	171	0.192	24

Table 3-10 Constants for Calculating the

Slot Time with DP/FMS (”Universal”) and DP with S5–95U (redundant optical ring)

Transmission		a	b	c
rate
12 Mbps		1651	240	28
6 Mbps		951	120	24
3 Mbps		551	60	24
1.5 Mbps		2011	30	24
500 Kbps		771	10	24
187.5	Kbps	771	3.75	24
93.75	Kbps	451	1.875	24
45.45	Kbps	851	0.909	24
19.2	Kbps	181	0.384	24
9.6	Kbps	171	0.192	24

PROFIBUS Networks SIMATIC NET	3-29
6GK1970-5CA20-0AA1 Release 2 05/2000