External device monitoring, Auxiliary monitor contact (model im-t-11a only), Figure 8. interface module pinouts – Banner Interface Modules User Manual

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which stops the machinery being controlled by immediately removing electrical power from the machine and (when necessary) by apply-
ing braking to dangerous motion.

IM-T-9A

IM-T-11A

Figure 8. Interface Module Pinouts

External Device Monitoring

To satisfy the requirements of Control Reliability (OSHA and ANSI), Category 3 and 4 of ISO 13849-1 (EN 954-1), the Machine Primary
Control Elements (MPCEs) must each offer a normally closed, forced-guided (mechanically linked) monitor contact. Connect one normal-
ly closed monitor contact from each Machine Primary Control Element as shown in the appropriate hookup drawing.
In operation, if one of the switching contacts of either MPCE fails in the energized condition, the associated monitor contact will remain
open. Therefore, it will not be possible to reset the Primary Safety Device. If no MPCE-monitor contacts are monitored, it is the user's
responsibility to ensure that any single failure will not result in a hazardous condition and will prevent a successive machine cycle.

Overvoltage Category II and III Installations (EN 50178 and IEC 60664-1)

The Safety Module is rated for Overvoltage Category III when voltages of 1V to 150V ac/dc are applied to the output relay contacts. It is
rated for Overvoltage Category II when voltages of 151V to 250V ac/dc are applied to the output relay contacts and no additional precau-
tions are taken to attenuate possible overvoltage situations in the supply voltage. The Module can be used in an Overvoltage Category III
environment (with voltages of 151V to 250V ac/dc) if care is taken either to reduce the level of electrical disturbances seen by the Module
to Overvoltage Category II levels by installing surge suppressor devices (e.g., arc suppressors), or to install extra external insulation in
order to isolate both the Safety Module and the user from the higher voltage levels of a Category III environment.
For Overvoltage Category III installations with applied voltages from 151V to 250V ac/dc applied to the output contact(s): the
Safety Module may be used under the conditions of a higher overvoltage category where appropriate overvoltage reduction is provided.
Appropriate methods include:

• An overvoltage protective device
• A transformer with isolated windings
• A distribution system with multiple branch circuits (capable of diverting energy of surges)
• A capacitance capable of absorbing energy of surges
• A resistance or similar damping device capable of dissipating the energy of surges

When switching inductive ac loads, it is good practice to protect the Safety Module outputs by installing appropriately-sized arc suppres-
sors. However, if arc suppressors are used, they must be installed across the load being switched (e. g., across the coils of external
safety relays), and never across the Safety Module’s output contacts (see WARNING, Arc Suppressors).

Auxiliary Monitor Contact (Model IM-T-11A Only)

The action of the auxiliary monitor contact, terminals 31-32, inversely "follows" the action of the safety outputs. The 31-32 auxiliary moni-
tor contact is to be used only for control functions that are NOT safety-related. A typical use is to communicate the status of the Safety
Module output to a programmable logic controller (PLC).
Many types of mechanisms are used to arrest dangerous machine motion. Examples include mechanical braking systems, clutch mecha-
nisms, and combinations of brakes and clutches. Additionally, control of the arresting scheme may be hydraulic or pneumatic. As a result,

IM-T-9A and IM-T-11A Interface Modules

P/N 062822 Rev. D