Overview of Safety System
AdeptModules Instruction Handbook, Volume 1: Adept MV Controller Interface, Rev. A 73
External E-Stop Input
Pins 42 and 44 on the Digital I/O connector on the SIO module must be connected
through a user-provided, normally closed (NC) safety circuit. Multiple external
emergency stop switches can be connected in series. (See Figure 3-2.) The E-Stop circuit
should also be used to monitor other safety-critical items, including but not limited to
safety barriers and encoder power supplies. Pins 41 and 43 also comprise part of the
E-Stop circuit – for most applications, connect pin 41 to pin 43.
Passive E-Stop Output
The passive E-Stop output from the SIO module consists of a normally open, voltage-free,
relay contact. It is controlled by signals received from the external E-Stop devices and the
MCP and Front Panel E-Stops. (See Figure 3-2.)
The passive E-Stop output uses only electromechanical relays to monitor the E-Stop
circuits. Many safety codes do not permit electronic control of E-Stop signals. Therefore,
the passive E-Stop output is often required to ensure that the user's equipment is shut
down if the E-Stop circuit is activated. The Passive E-Stop output should also be used to
control any other user devices in the workcell that need to be stopped in an emergency.
Such devices might include other moving equipment such as conveyor belts, indexing or
transfer devices, pneumatic systems, etc.
The passive E-Stop output is rated at 10 VA, for example 0.8A at 12 Vdc or 0.4A at 24 Vdc.
This rating must not be exceeded.
The specifications for the relay in the passive E-Stop circuit are:
• maximum switching power = 10 VA (volt amps)
• maximum switching voltage = 100 Volts DC, 70 Volts AC rms
• maximum switching current = 0.5 Amps DC, 0.3 Amps AC rms
CAUTION: The power through the relay must not exceed 10 VA.
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