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Technical Description
The Ready delay time is the time that elapses between the arrival of the Request signal in the
module and the module's Ready signal.
The delay time depends on
•
The Ready delay time of the module itself
•
The interface module used and
•
The length of the cable
In a distributed configuration, the communications link delay must also be taken into account.
The signal propagation rate is 6 µsec./km, i.e. a distance-velocity lag of 2 x 6 µsec.=12 µsec. must
be taken into account for a cable with a length of 1000 m (3,300 ft.).
If the CPU does not receive the Ready signal within 160 µsec., it stops and outputs the "QVZ"
(time-out) error message.
Table 2-6. Ready Delay Times of the Various I/O Modules
I/O Modules
Digital modules
Analog modules
313 watchdog modules
IP 240
IP 241
IP 242 (Release A00)
IP 242 (Release A01)
IP 243 (Analog module)
IP 244
IP 245
IP 246
IP 247
IP 252
WF 625
CP 513-3M
CP 524
CP 525
CP 526
CP 527
CP 530
CP 535
CP 551
CP 552
CP 5430
CP 143
2-24
Ready Delay Time in µsec.
2
16
1
1
1
140
50
35
150
0.5
1.5
1.5
10
3
5
1
3
3
3
3 to 130
3
3
3
1
3
S5-115U Manual
EWA 4NEB 811 6130-02b
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