Siemens SIMATIC S5-115U, User Manual

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Technical Description S5-115U Manual
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
µ
sec./km, i.e. a distance-velocity lag of 2 x 6
µ
sec.=12
µ
sec. 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 µ sec., it stops and outputs the "QVZ"
(time-out) error message.
Table 2-6. Ready Delay Times of the Various I/O Modules
2
Ready Delay Time in µ sec.
Digital modules
Analog modules 16
313 watchdog modules 1
IP 241 1
IP 242 (Release A00) 140
IP 242 (Release A01) 50
IP 244
IP 245
IP 246
IP 247
IP 252
WF 625
CP 513-3M
CP 524
CP 525
CP 526
CP 530
CP 535
150
0.5
1.5
1.5
10
3
5
1
3
3
3 to 130
3
IP 243 (Analog module) 35
IP 240 1
CP 551
CP 552
3
3
CP 527 3
I/O Modules
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1 CP 5430
CP 143 3
2-24
EWA 4NEB 811 6130-02b