Technical Data Sheet 2.50-35.021-01-en Rev
D e v i ce De s c ri p ti on
FSM21 Front Switch Module
For connection to the FBM38 fieldbus module.
A
Green signal LED (1.1/1.2, 2.1/2.2) with “Remote” operating mode activated
Two signal LEDs are found to the right of each manual/automatic switch. They are used to display operating
messages on binary inputs 51/IN–54/IN of the FBM38 (e.g. display of feedback from the connected
devices/units).
The green signal LEDs on the control channels can be switched off as required (see the “LED Settings” section).
S
ignal LED 1.1: On when binary input 51/IN of the FBM38 switches
S
ignal LED 1.2: On when binary input 52/IN of the FBM38 switches
S
ignal LED 2.1: On when binary input 53/IN of the FBM38 switches
Signal LED 2.2: On when binary input 54/IN of the FBM38 switches
Upcoming operating messages are signaled by a constantly lit LED.
If an operating message input does not match the corresponding control signal after 3 seconds have elapsed,
then the signal LEDs begin to flash. The active operating message is signaled by a constantly lit LED when the
operating message input and control signal match.
Green signal LED (1.1/1.2, 2.1/2.2) with “Local” operating mode activated
Two signal LEDs are found to the right of each manual/automatic switch. They are used to display the switching
states of the assigned output relay on the FBM38.
Switched levels lead to a constantly lit green LED.
Delayed switches within the load/rolling switch are signaled by a flashing LED.
The green signal LEDs on the control channels can be switched off as required (see the “LED Settings” section).
Red malfunction message LED (1.3/1.4, 2.3/2.4)
Two red malfunction message LEDs are found to the right underneath each manual/automatic switch. They are
used to display malfunction messages on binary inputs 55/IN–58/IN of the FBM38.
S
ignal LED 1.3: On when binary input 55/IN of the FBM38 switches
S
ignal LED 1.4: On when binary input 56/IN of the FBM38 switches
S
ignal LED 2.3: On when binary input 57/IN of the FBM38 switches
Signal LED 2.4: On when binary input 58/IN of the FBM38 switches
The malfunction messages are acknowledged on the backbone connection SSM-Q of the FBM38.
The signaling of malfunction messages is described in detail in the macro description of the FBM38 fieldbus
module (see Technical Data Sheet 2.50-30.038-02-en).
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