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Specifications of the MA 21
Element
Switch S4
bus termination RS 485
Client interface
Voltage supply of external
device
not MA 21 100.2
Operating voltage
Indicator LEDs
Located at the rear are 6 LEDs that indicate the operating states of the MA 21:
Figure 3.6: Rear view: LEDs on the MA 21
LED
RDY (green)
Operational readiness
(ready)
ERR (yellow)
Error
14
Function
Position 1: Bus termination switched on
Position 2: Bus termination switched off, necessary for
the network
Terminals 26 ... 28: Connection terminals for the external
RS 232 (not assigned with MA 21 100.2)
Terminals 30 and 31:
terminals 15 and 16:
Terminals 17 ... 21: Connection terminals for operating
voltage (18 ... 36 V DC) MA 21 and connected device.
Attention!
PE must be connected due to the interference-
suppression circuit!
State
flashing
continuous light
flashing
continuous light
MA 21
5.2 V DC ± 5 %, max. 0.8 A
24 V DC
Meaning
• Setup menu is active
• A reset or restart is being per-
formed
• Ready
• Special function is being per-
formed
• Setup menu is active
• Hardware error or serious soft-
ware error
• Reset is being started
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