FX Series Programmable Controllers | Devices in Detail 4 |
4.4State Relays
FX1S | FX1N | FX2N | FX2NC |
Device Mnemonic: S
Purpose: Internal programmable controller status flag
Alias: State (coil/ relay/ contact/ flag)
S (coil/ relay/ contact /flag)
STL step (coil/ relay/ contact /flag)
Annunciator flag
Available forms: NO (➀ ) and NC contacts and output coils (➁ ) (see example device usage for references)
Devices numbered in: Decimal, i.e. S0 to S9, S10 to S19
Further uses: General stable state - state relays - see page
Annunciator flags - see page
Example device usage:
X0
S20
X1
S20
2
1
4.4.1General Stable State - State Relays
A number of state relays are used in the PLC. The coils of these relays are driven by device contacts in the PLC in the same manner that the output relays are driven in the program.
All state relays have a number of electronic NO and NC contacts which can be used by the PLC as required. Note that these contacts cannot directly drive an external load. Only output relays can be used to do this.
Available devices:
•Please see the information point on page