Gemini GV6K and Gemini GT6K Programmer's Guide

Programmable Inputs and Outputs (onboard and external inputs & outputs)
Programmable inputs and outputs allow the controller to detect and respond to the state of
switches, thumbwheels, electronic sensors, and outputs of other equipment such as drives and
PLCs. The I/O that may be used as programmable inputs and outputs are:
• Onboard I/O:
− Limit inputs on the Drive I/O connector (pins 28, 29, and 31)
− Trigger inputs on the Drive I/O connector (pins 37 and 38). A “master trigger” is
also available on the Drive I/O connector (pin 35). These are general purpose on
board digital inputs but can be redefined as trigger inputs.
− Digital outputs on the Drive I/O connector (pins 41, 43, 45, 46, 48, and 49)
− Relay output on the +24VDC power input connector (screw terminals)
• Expansion I/O located on I/O bricks connected to the Gem6K controller’s “EXPANSION
I/O” connector. Each I/O brick can hold from 1 to 4 of these I/O SIM modules in any
combination (each SIM module provides 8 inputs or outputs, for a total of 32 I/O points
per I/O brick):
− Digital inputs
− Digital outputs
− Analog inputs
− Analog outputs
USING THE STATE OF I/O TO CONTROL PROGRAMMED EVENTS: Based on the
binary state of the inputs and outputs (binary status can be used in assignment/comparison
operations using the LIM, IN and OUT operators), the controller can make program flow
decisions and assign values to binary variables for subsequent mathematical operations. These
operations and the associated program flow, branching, and variable commands are listed below.
Operation based on I/O State Associated Commands See Also*
I/O state assigned to a binary variable LIM, [IN], [OUT], VARB Variables (page 18)
I/O state used as a basis for
comparison in conditional branching &
looping statements
Input state used as a basis for a
conditional GO
I/O state used as a basis for a
program interrupt (GOSUB)
conditional statement
Mimic PLC functionality by scanning
I/O states with a compiled program
LIM, [IN], [OUT], IF,
ELSE, NIF, REPEAT,
UNTIL, WAIT, WHILE,
NWHILE
Program Flow Control (page 23)
[IN], GOWHEN, LIM Synchronizing Motion (page 163)
ONIN Program Interrupts (page 29)
PLCP, SCANP PLC Scan Mode (page 120)
* Refer also to the respective command descriptions in the Gem6K Series Command Reference.
I/O UPDATE RATE: The programmable inputs and outputs are sampled at the “system
update rate,” which is every 2 ms.
EXPANSION I/O BRICKS: If the I/O brick is disconnected or if it loses power, the
controller will perform a kill (all tasks) and set error bit #18 (see ERROR). (If you disable the
“Kill on I/O Disconnect” mode with KIOENØ, the Gem6K will not perform the kill.) The
controller will remember the brick configuration (volatile memory) in effect at the time the
disconnection occurred. When you reconnect the I/O brick, the controller checks to see if
anything changed (SIM by SIM) from the state when it was disconnected. If an existing SIM
slot is changed (different SIM, vacant SIM slot, or jumper setting), the controller will set the
SIM to factory default INEN and OUTLVL settings. If a new SIM is installed where there was
none before, the new SIM is auto-configured to factory defaults.
90 Gem6K Series Programmer’s Guide