ABB FSO-21 - How to Configure a Cascaded System

322 Configuration
 How to configure a cascaded system
This example shows how to configure the cascaded system (Cascade A) as shown in
section Cascade on page 62. The SSE function is used as an example (Safety
function 1 in the figure on page 62). In this configuration example, Cascade B is not
configured (parameter SAFEIO.13 Cascade B = None).
1. Define one of the FSO modules as the master and the other FSO modules are
followers in Cascade A:
• In the master FSO: SAFEIO.11 M/F mode for cascade =
A = master, B = master (only Cascade A is configured in this example).
• In the follower FSOs: SAFEIO.11 M/F mode for cascade =
A = follower, B = follower (only Cascade A is configured in this example).
2. Connect a digital input to the corresponding digital output in the cascaded system
(single cascade X113:2 -> X113:8):
• SAFEIO.12 Cascade A = X113:2 -> X113:8.
3. Set the digital inputs and outputs of the SSE function as defined for the cascaded
system:
• The SSE function is activated from a redundant digital input in the master FSO
(SSE.11 SSE input A = DI X113:1&X114:1)
• The SSE function is cascaded back to the master FSO with a single digital
input and output
(SSE.12 SSE input B = DI X113:2, SSE.21 SSE output = DO X113:8)
• The SSE function is cascaded with a single digital input and output in the
follower FSOs (SSE.12 SSE input B = DI X113:2, SSE.21 SSE output =
DO X113:8).
Note: Do not use the completed output of the safety function as the cascaded
output (parameter (SSE.22 SSE completed output = None, or you can use this
output for the safety function indication).
4. Set the acknowledgement method in the master FSO modules (in this example,
Manual is used):
• STO.02
STO acknowledgement = Manual
5. Set the digital input for the acknowledgement button in the master FSO module:
• FSOGEN.42 Acknowledgement button input = DI X114:2.
6. Set the acknowledgement method in the follower FSO modules (must be
Automatic in the follower FSOs).
• STO.02 STO acknowledgement = Automatic
7. Set the other parameters related to the SSE function as defined in section
Configuring SSE on page 351.