G7TC
G7TC
16
Precautions
General
I/O Relays and I/O Block Bases can be combined as follows to form I/O Blocks:
I/O Blocks Block Base
*3
I/O Relay I/O SSR
*2
DC output G7TC-OC16
G7TC-OC16-1
P7TF-OS16
P7TF-OS16-1
G7T–1112S (SPST-NO type)
*1
G7T–1012S (SPST-NC type)
AC G3TA-OA202SZ
G3TA-OA202SL
G7TC-OC08
P7TF-OS08
DC G3TA-ODX02S
G3TA-OD201S
DC input G7TC-ID16 P7TF-IS16 (DC
type)
G7T-1122S
*1
DC G3TA-IDZ002 (M)
AC input G7TC-IA16 P7TF-IS16 (AC
type)
AC G3TA-IAZR02S
*1 These are the I/O Relays mounted on the G7TC I/O Relay Terminal.
*2 To use I/O SSRs, remove the I/O Relays and mount the I/O SSRs to the slots where the I/O Relays were mounted. Or, order and combine a
P7FT I/O Terminal and I/O SSRs.
*3 The P7TF I/O Terminal provides only sockets. It does not have Relays mounter to it. Mount I/O Relays or I/O SSRs to the sockets. Specify
the rated voltage in the same way as when ordering the G7TC I/O Relay Terminal.
• Combinations of AC Input Relays/SSRs and DC Input
Relays/SSRs cannot be used with the same Terminal. This is
because specifications for coil surge suppression elements are
different.
Relays/SSRs with different voltage specifications cannot be
used with the same Terminal. (For example, a 100-VAC Input
Relay and a 200-VAC Input Relay, or a 12-VDC Output Relay
and a 24-VDC Output Relay cannot be used with the same Ter-
minal.) This is because specifications of operation indicator cir-
cuits are different.
• Only use I/O Terminals, I/O Relays, and I/O SSRs with the same
specifications for rated voltage.
General
• I/O Blocks are color coded, as shown below, according to
input/output and AC/DC specifications.
I/O Terminal
label
I/O Terminal
indicators
I/O Relay
case
Output
Block (DC)
Yellow Green Transparent
Input
DC Red Green Green
Block
AC Red Red Red
• Both Input and Output Blocks do not have internal power
supplies. For an Output Block, supply the relay drive power to the
positive and negative terminals (either 12 or 24 VDC). Loads
(terminal contacts 0 through 15) must also be supplied with
appropriate power. For an Input Block, supply, to the positive and
negative terminals, power for input signals to the controller.
• The same Connecting Cable, G79-Y, is used for the
G7TC-OC08 eight-point Output Block as for other I/O Blocks;
leave 8 points unconnected.
• Indicators indicate the presence or absence of signals.
Use the display lever inside each relay for fault diagnosis. (Some
relays do not have this lever depending on the specifications.)
• Each relay must be pressed down until its hold-down hooks
engage completely. Heating or malfunction can result if relays
are not mounted properly.
• Unlabeled terminals are not electrically connected. Use these for
repeater terminals.
• Indicator positions and relay orientation differ between Input and
Output Blocks. This is to aid in differentiating Input Blocks from
Output Blocks and in following signal flow.
• DC Input Blocks and Output Blocks with G3TA-OD have
positive and negative terminals, with the positive terminals
normally being on the top of the I/O Block. Reversing positive
and negative terminals will prevent operation.
• DIN tracks are generally used to mount I/O Blocks. For screw
mounting, a 210-mm DIN track is available that can be used as
an adapter in combination with End Plates (PFP-M, two
required).
• A Shorting Bar is provided to connect four terminals. The current
capacity of the shorting bar is 20 A. As long as this current
capacity is not exceeded, the shorting bar can be used in
combination as shown at the right to connect more than four
terminals.
• Special Connecting Cables are provided for connections to
OMRON SYSMAC I/O Units with Connectors. Connecting
Cables with two connectors, however, come in two types: Cables
for Input Blocks (G79-I) and Cables for Output Blocks (G79-O).
Be sure to purchase the correct Cable for the application.
