In the following, the maximum response times are calculated that elapse between the signal change of a safety-relevant digital input and the response of the safety-relevant digital output.
Note
The maximum response times must be observed in the case of the safety shut-offs!
The hardware inputs generally have a switch-on and switch-off delay to counteract the influence of surge impulses.
All hardware inputs have a start delay:
-
FSC-01 by 130 ms
-
FSC-IO 4DI/1AI by 130 ms
-
FSC-02 by 100 ms
The following figure shows the signal paths for calculating the maximum response times TR HW of the hardware:
Explanation of the abbreviations/acronyms used in the figure
| Abbreviation |
Designation |
| TMO |
Receive Timeout Monitoring time in the FSC-01 in which a valid response from the FSC-02 must be received. After this period has elapsed, the safety-relevant communication will be terminated. |
| PR |
Production Rate The minimum interval between two data transmissions. 0 ms if "Product Rate" = 0 (standard case), otherwise "Receive TMO" + watchdog time of the FSC-02. |
| In1 |
Input signal on FSC-01 |
| In2 |
Input signal on FSC-01 via seavis IO |
| Out1 |
Meaning |
| WDT |
Watchdog time. The maximum permissible duration of the RUN cycle of an FSC |
| TR |
Response time (worst case). The maximum response time for the transmission of a signal change of a physical input (In) on FSC-01 until the change in the physical output (Out) on FSC-01. A safety-relevant protocol is used for the data transmission. |
| TR HW |
Hardware response time. The sum of the individual hardware response times. |
| TR SW |
Software response time. Delay time hard-coded in the software (cannot be changed). |
The formulas for the signal paths can be used to calculate the maximum response times TR HW of the hardware.
TR IN1/Out1 = 2 x WDZ
TR IN2/Out1 = TIO + 2 x WDZ
The formulas for the signal paths can be used to calculate the maximum response times TR HW of the hardware.
Calculating the maximum response times TR HW
| Formula |
TIO |
2 x WDZ2 |
TMO |
2 x WDZ1 |
TMO |
2 x WDZ2 |
TR HW |
| TR In1/Out1 = |
- |
- |
- |
250 ms |
- |
= 250 ms |
| TR In2/Out1 = |
50 ms |
- |
- |
250 ms |
- |
= 300 ms |
| TR In3/Out1 = |
50 ms |
50 ms |
250 ms |
250 ms |
- |
= 600 ms |
| TR In4/Out1 = |
- |
50 ms |
250 ms |
250 ms |
- |
= 550 ms |
| TR In1/Out2 = |
- |
- |
- |
250 ms |
250 ms |
100 ms |
= 600 ms |
| TR In2/Out2 = |
50 ms |
- |
- |
250 ms |
250 ms |
100 ms |
= 650 ms |
| TR In3/Out2 = |
50 ms |
50 ms |
250 ms |
250 ms |
250 ms |
100 ms |
= 950 ms |
| TR In4/Out2 = |
- |
50 ms |
250 ms |
250 ms |
250 ms |
100 ms |
= 900 ms |
Note
If the FSC-02 is used for the expansion of the safety-relevant digital inputs and outputs, the output configurations 227 to 231 will be used. In this output configuration, the fuel valves are exclusively controlled by FSC-01. In this way, shorter response times in the case of a safety shut-off are achieved. FSC-02 exclusively controls noncritical outputs in terms of safety.
The maximum response times TR of the input signals are calculated in the table below:
Maximum response times TR of the input signals
| Designation |
TR INx/Outx |
TR HW |
TR SW |
TR |
| Safety interlock circuit before fan start |
TR In2/Out1 |
300 ms |
650 ms |
= 950 ms |
| Safety interlock circuit after fan start |
TR In2/Out1 |
300 ms |
650 ms |
= 950 ms |
| Safety interlock circuit fuel 1 |
TR In2/Out1 |
300 ms |
650 ms |
= 950 ms |
| Safety interlock circuit fuel 2 |
TR In2/Out1 |
300 ms |
650 ms |
= 950 ms |
| Safety interlock circuit fuel 3 |
TR In2/Out1 |
300 ms |
650 ms |
= 950 ms |
| " |
TR In3/Out1 |
600 ms |
350 ms |
= 950 ms |
| Safety interlock circuit for atomization |
TR In2/Out1 |
300 ms |
650 ms |
= 950 ms |
| Safety interlock circuit operation |
TR In2/Out1 |
300 ms |
650 ms |
= 950 ms |
| " |
TR In3/Out1 |
600 ms |
350 ms |
= 950 ms |
| Combustion air pressure monitor MIN |
TR In1/Out1 |
250 ms |
700 ms |
= 950 ms |
| Gas pressure monitor MIN fuel 1 |
TR In1/Out1 |
250 ms |
650 ms |
= 900 ms |
| " |
TR In4/Out1 |
550 ms |
350 ms |
= 900 ms |
| Gas pressure monitor MIN fuel 2 |
TR In1/Out1 |
250 ms |
650 ms |
= 900 ms |
| Gas pressure monitor MIN fuel 3 |
TR In1/Out1 |
250 ms |
650 ms |
= 900 ms |
| " |
TR In4/Out1 |
550 ms |
350 ms |
= 900 ms |
| Pressure monitor VPS test pressure MAX fuel 1 |
TR In1/Out1 |
250 ms |
650 ms |
= 900 ms |
| " |
TR In4/Out |
550 ms |
350 ms |
= 900 ms |
| Pressure monitor VPS test pressure MIN fuel 1 |
TR In1/Out1 |
250 ms |
650 ms |
= 900 ms |
| " |
TR In4/Out1 |
550 ms |
350 ms |
= 900 ms |
| Pressure monitor VPS test pressure MAX fuel 2 |
TR In1/Out1 |
250 ms |
650 ms |
= 900 ms |
| " |
TR In4/Out1 |
550 ms |
350 ms |
= 900 ms |
| Pressure monitor VPS test pressure MIN fuel 2 |
TR In1/Out1 |
250 ms |
650 ms |
= 900 ms |
| " |
TR In4/Out1 |
550 ms |
350 ms |
= 900 ms |
| Pressure monitor VPS test pressure MAX fuel 3 |
TR In1/Out1 |
250 ms |
650 ms |
= 900 ms |
| " |
TR In4/Out1 |
550 ms |
350 ms |
= 900 ms |
| Pressure monitor VPS test pressure MIN fuel 3 |
TR In1/Out1 |
250 ms |
650 ms |
= 900 ms |
| " |
TR In4/Out1 |
550 ms |
350 ms |
= 900 ms |
| Flame signal 1 |
TR In1/Out1 |
250 ms |
50 ms |
= 300 ms |
| Flame signal 2 |
TR In1/Out1 |
250 ms |
50 ms |
= 300 ms |
| Contactors / NC contact circuit |
TR In1/Out1 |
250 ms |
50 ms |
= 300 ms |
| " |
TR In4/Out1 |
550 ms |
0 ms |
= 550 ms |
| Purge suppression |
TR In1/Out1 |
250 ms |
50 ms |
= 300 ms |
| Release flue gas recirculation |
TR In1/Out1 |
250 ms |
50 ms |
= 300 ms |
| " |
TR In4/Out1 |
550 ms |
0 ms |
= 550 ms |
| External purge position reached |
TR In1/Out1 |
250 ms |
50 ms |
= 300 ms |
| " |
TR In4/Out1 |
550 ms |
0 ms |
= 550 ms |
| External ignition position reached |
TR In1/Out1 |
250 ms |
50 ms |
= 300 ms |
| " |
TR In4/Out1 |
550 ms |
0 ms |
= 550 ms |
| Support mode waste incineration plants |
TR In1/Out1 |
250 ms |
50 ms |
= 300 ms |
| " |
TR In4/Out1 |
550 ms |
0 ms |
= 550 ms |
| Blow-out valve open |
TR In1/Out1 |
250 ms |
50 ms |
= 300 ms |
| Primary air pressure MIN |
TR In1/Out1 |
250 ms |
700 ms |
= 950 ms |
| Oil pressure monitor MIN |
TR In1/Out1 |
250 ms |
700 ms |
= 950 ms |
| Safe start enable |
TR In1/Out1 |
250 ms |
700 ms |
= 950 ms |