Hitachi SJ Series, User Manual

Page: 707 / 786

21-36
Chapter 21 Technical Notes
21.4 STO Terminal Functions
21.4.1 Safety Function
– STO (Safe Torque Off)
・
The SJ Series P1 is equipped with the STO (Safe
torque off) function defined in IEC61800-5-2.
This function is equivalent to stop category 0 defined in
EN/IEC60204-1.
・
The section describes only the functions of STO
terminals. If this product is handled as a product
with certification of safety function, make sure to
check the SJ-P1 Safety Function Guide separately
provided, and perform work (verification, validity
confirmation, etc.) required for a functional safety
system. The contents described in the SJ-P1 Safety
Function Guide shall take precedence.

Terminal specifications
21.4.2 Operation Procedure of Safety Function

STO input terminal
・
Input of STO signal is performed by redundant input of
STO terminals ST1 and ST2.
・
When voltage is applied to each input terminal and
current flows, operation of safety path is enabled.
(When shipped from the factory, operation is always
enabled. See the figure below.)
・
If voltage is not applied to at least one of the input
terminals, the corresponding blocking path shuts off
output of the inverter.
Terminal symbol Terminal name Description Electrical characteristics
P24S
24V output terminal
(for STO input only)
A DC24V power supply for contact signals
dedicated for ST1/ST2 terminals. The common
terminal is CMS.
Maximum output current: 100mA
CMS
24V output terminal common
(for STO input only) A common terminal for DC24V power supply for
contact signals dedicated for ST1/ST2 terminals.
STC Input logic switching terminal
A logic switching terminal for STO input.
You can change the input logic changing the
connecting point of short-circuit line.
When an external power supply is used, remove
the short-circuit line and use this terminal as the
input common for ST1/ST2. <for sink logic>
Short-circuit line: Connect between
P24S and STC
<For source logic>
Short-circuit line: Connect between
CMS and STC
ST1/ST2 STO input terminal An input terminal of STO.
Voltage between ST1 and STC/ST1
and STC
・
ON voltage: Min.DC15V
・
OFF voltage Max. DC5V
・
Maximum allowable voltage
DC27V
・
Load current 5.8mA (at DC27V)
Internal resistance: 4.7kΩ
ED+
EDM signal output terminal
(+) A plus terminal of EDM signal (STO status
monitoring). Open collector output
・
Between ED+ and ED-
・
Voltage drop at ON: 4V or less
・
Maximum allowable voltage: 27V
・
Maximum allowable current: 50mA
ED-
EDM signal output terminal
(-) A minus terminal of EDM signal (STO status
monitoring).
Connection of STO input terminal
When shipped from the factory,
wiring is performed so that STO
terminal is disabled.
S
Control circuit terminal area
STO terminal
P24S STC CMS
ST1 ST2 STC
Always drive the STO function
using both STO inputs.
Sink logic inverter
model:
P1-*****-*FF
or
P1-*****-*FUF
STO terminal
P24S STC CMS
ST1 ST2 STC
Source logic inverter
model:
P1-*****-*FEF
or
P1-*****-*FCF