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Rockwell Automation Publication 440R-UM013E-EN-P - March 2017
Chapter 3
Power, Ground, and Wire
Devices with OSSD Output
Devices, such as the GuardShield™ safety light curtains, SafeZone™ laser
scanners, SensaGuard™ interlock switch, TLS-Z and 440G-LZ guard locking
switches, and Bulletin 442G Multifunction Access Box (MAB) have
current-sourcing PNP semiconductor outputs (OSSD), which send their own
pulse-tested safety signals through their outputs. These devices do not need to
be connected to the safety relay pulse-testing outputs. These devices must have
a common power supply reference (24V Com).
shows a typical example of the connections for devices, like light
curtains or laser scanners, with non-cascadable OSSD outputs.
Figure 10 - Example Connections to Devices with Non-cascadable OSSD Outputs
shows an example of a wiring configuration that includes
non-cascadable and cascade-able devices. The non-cascadable devices (Devices
1 and 2) must always start the cascade. Many cascadable devices (Devices 3…6
or more) can be included in the input circuit. All devices must have the same
voltage supply reference (for instance, 24V Com) as the safety relay.
Examples of non-cascadable devices include GuardShield light curtains,
SafeZone laser scanners, and safety sensors. Examples of cascadable devices
include SensaGuard interlocks, and the TLS-ZR and 440G-LZ guard locking
interlocks.
Devices with electromechanical (EM) outputs must be placed after the non-
cascadable device. The EM devices can be placed anywhere in the chain after
the first OSSD device.
TIP
• OSSD1 can be connected to either S12 or S22 and OSSD2 can be
connected to either S12 or S22.
• The safeguarding devices must have the same voltage supply reference
(24V Com) as the safety relay.
ATTENTION:
You must consider the cumulative response time of all
cascaded devices, the relay, and output devices to verify that the safety
function is fulfilled within the required time that the risk assessment
determines.
DI and DIS
A2
Device 1
Device 2
S12
A1
A2
A1
A2
Input 2
Input 1
S22
S32 S42
CI and SI
A1
A2
A1
S12
Input 1
S22
+24V DC
24V Com
Device 1
A1
A2
Содержание Guardmaster
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Страница 34: ...34 Rockwell Automation Publication440R UM013E EN P March 2017 Chapter 3 Power Ground and Wire Notes...
Страница 40: ...40 Rockwell Automation Publication440R UM013E EN P March 2017 Chapter 4 Configuration Notes...
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