7.1 Relay settings
Relay assignmentIn V1H4 and V1H9, relays 1 or 2 can be assigned to the corresponding measuring
channel by entering the channel number »1« or »2«.
Step Matrix Entry Significance
1 V1H9 e.g. 1 Relay 2 is assigned to channel 1
2 - »E« Register entry
Switch pointThe switch point is set at V1H0 for relay 1 and V1H5 for relay 2 in the units used for
calibration or linearization.
Step Matrix Entry Significance
1 V1H0 e.g. 200 Switch point for relay 1 (in the unit displayed in field V0H0)
2 - »E« Registers entry
Note!
• If the relays are assigned to channel 2, the switch point is set at V8H6 as described
in Chapter 8, Section 8.2 and 8.3.
Fail-safe modeThis function determines whether the relay is to act as a minimum or maximum limit
switch, entries are made at V1H1 for relay 1 and V1H6 for relay 2:
• 0 = minimum fail-safe: the relay de-energises if the level or volume drops
below the value
• 1 = maximum fail-safe: the relay de-energises if the level or volume rises
above the value
Step Matrix Entry Significance
1 V1H1 e.g. 0 Relay 1 de-energises when the product level drops below
the switch point
2 - »E« Register entry
Minimum fail-safe mode, setting 0 Maximum fail-safe mode, setting 1
Level Relay status LED Level Relay status LED
Drops below
switch point
De-energised Green off
Red on
Rises above
switch point
De-energised Green off
Red on
Rises above
switch point
Energised Green on
Red off
Drops below
switch point
Energised Green on
Red off
Table 7.2:
Function of the relays at
minimum and maximum
fail-safe mode
z18 d20 z20
z22 d24 z24
z18 d20 z20
z22 d24 z24
z18 d20 z20
z22 d24 z24
z18 d20 z20
z22 d24 z24
Silometer FMC 671 Z/676 Z Chapter 7: Limit Switches
37
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