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Introduction
1.6 Muteable Safety Stop Interface (MSSI)
The Muteable Safety Stop Interface (MSSI) input is a specialized USSI that can
be muted during the non-hazardous portion of the machine cycle and provides
+24V dc supply power to the primary safety device that is to be muted.
The Module requires redundant input signals from the external primary safeguard
which is to be muted. These inputs typically are either two Banner solid-state
safety outputs with "handshake capability" (i.e., OSSDs), or two monitored
forced-guided relay outputs (i.e., FSDs) from an appropriate safety device. See
Section 2, Specifications, and Section 3.5.5 for complete information.
1.7 Universal Safety Stop Interface (USSI)
The Module has a provision for an additional Safety Stop Interface to connect an
optional device, such as a supplemental safeguard, E-stop button, or safety
switch(es), to issue a stop command. This dual-channel interface is similar to the
MSSI, but is always functional, even when the primary safety device is being
muted. See Sections 2, Specifications, and 3.5.5 for complete information.
1.8 OSSD Outputs
The Module has two solid-state safety outputs, labeled "OSSD1" and "OSSD2"
(see Figure 1-1). These safety outputs are actively monitored to detect short cir-
cuits to the supply voltage, to each other, and to other sources of electrical ener-
gy. If a failure is detected, the outputs will switch to an OFF-state. For circuits
requiring the highest level of safety and reliability, either OSSD must be capable
of stopping the motion of the guarded machine in an emergency.
To ensure Safety Category 4 (per ISO 13849-1/EN954-1), the OSSDs are compat-
ible with the "handshake" protocol of Banner Engineering safety devices with
Universal Safety Stop Interfaces (USSIs). This handshake verifies that the inter-
face of the two devices is capable of detecting certain unsafe failures that may
occur, such as a short-circuit to a secondary source of power or to the other
channel, high input resistance, or the loss of signal ground.
During the muted portion of the machine cycle, the MSSI inputs will be ignored
and OSSD1 and OSSD2 will remain ON. During other portions (not muted) of the
cycle, if the MSSI either open or go OFF, OSSD1 and OSSD2 will go OFF.
In any case, if the USSI interface opens, OSSD1 and OSSD2 will go OFF. See
Appendix A for timing diagrams.
1.9 Auxiliary Output (Aux)
The Auxiliary (Aux) monitoring PNP output is intended for non-safety related pur-
poses. The status of this auxiliary output is indicated by the green status LED.
See Section 3.5.3 for more information.
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MM-TA-12B Muting Module
Instruction Manual
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