Introduction
MM-TA-12B Muting Module
Instruction Manual
manual reset, for the OSSD outputs to turn ON, both the MSSI and the USSI
must both be active (closed) and a monitored manual reset must be accom-
plished. The reset is accomplished by closing the RESET input for a minimum of
1/4 second, but not longer than 2 seconds and then re-opening the input. The
OSSD outputs will turn ON once the open-closed-open action occurs.
In this configuration, the MM-TA-12B Muting Module must be manually reset
after power-up, lockouts, and after the cycling of either the MSSI (not muted) or
the USSI. The location for the manual reset device (e.g,. a normally open key
switch) must comply with the warning in Section 3.5.1 and refer to that section
for further information on key resets.
Automatic Reset
Upon power-up, when the Module is configured for automatic reset, the OSSD
outputs will automatically turn ON once power is applied, the self-test is accom-
plished, and the MSSI and the USSI are active (closed). The OSSD outputs will
also turn ON after either interface is opened and then re-closed. In either case, no
external input or reset is required.
Automatic reset is typically used in situations where the individual is continually
sensed by the defined area or in situations where supplemental safeguards pre-
vent the initiation of hazardous motion while an individual is within the safe-
guarded space (e.g. point-of-operation guarding).
In either case, a manual reset must be performed to recover from a lockout con-
dition.
1.4 Lockout Conditions
A lockout condition of the Module will cause both OSSD outputs to go OFF and
the Aux output to open. A lockout condition is indicated by a flashing Red status
indicator and an error number displayed on the Diagnostic Display.
A description of possible lockouts, their causes, troubleshooting hints, and a
Manual Reset routine are listed in Section 5.
1.5 Control Reliability: Redundancy and Self-Checking
Redundancy requires that Module circuit components be “backed up” to the
extent that, if the failure of a single component will prevent effective machine
stopping action when needed, that component must have a redundant counter-
part which will perform the same function. The microprocessor-controlled Muting
Module is designed with diverse redundancy. Diverse-redundant components are
of different designs, and microprocessor programs used by them run from differ-
ent instruction sets.
Redundancy must be maintained for as long as the Muting Module is in opera-
tion. Since a redundant system is no longer redundant once a component has
failed, the Module is designed to be continuously self-checking. A component
failure detected by or within the self-checking system causes a “stop” signal to
be sent to the guarded machine and puts the Module into a lockout condition.
Recovery from this type of lockout condition requires replacement of the failed
component (to restore redundancy) and the appropriate reset procedure (see
Section 3.5.1). Possible causes are listed in Section 5. The Diagnostic Display is
used to diagnose causes of a lockout condition (Section 5.1).
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