S5-95U, SINEC L2 Data Transmission Using Cyclic I/O
ZP Slave Watchdog
The S5-95U as a ZP slave has a watchdog. If the ZP slave is not scanned cyclically within the
“response time” by a ZP master, bit 7 “ZP master failure” is set in the ZP slave status byte and the
entire ZPE in ZP DB is set to zero.
Table 7-3 lists the ZP slave “response time” for the S5-95U calculated from the Baud rate at a
given slot time.
Table 7-3. ZP Slave “Response Time” for the S5-95U Calculated from the Baud Rate at a
Given Slot Time
*
One bit time unit is the time it takes to transmit one bit (reciprocal value of baud rate)
Slot-TimeBaud Rate ZP Slave “Response Time”
9.6 kBaud
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6 s
19.2 kBaud
39.75 kBaud
187.5 kBaud
500 kBaud
1500 kBaud
3 s
0.654 s
0.381 s
0.207 s
0.125 s
73 bit time units*
76 bit time units*
400 bit time units*
1000 bit time units*
99 bit time units*
170 bit time units*
If you are using a slot time that differs from the ones listed in Table 7-3 (permissible range for slot
time: 50 to 4095), you can calculate the “response time” with the following formula:
T
response
= 140 · (T
slot
+ 341) · T
bit
T
response
= ZP slave response time in seconds
T
slot
= Slot time in bit time units
T
bit
= Bit time units = in seconds
1
bdr
Minimum ZP slave response time: 100 ms (i. e., if the calculated T
response
is < 100 ms, the
minimum ZP slave response time is 100 ms)
Maximum ZP slave response time: 5 min (i. e., if the calculated T
response
is >5 min, the
maximum ZP slave response time is 5 min)
Tolerance: - 0% +20% T
response
EWA 4NEB 812 6112-02
7-11
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