Accessory 24E2
Encoder 2
RP24
6-pin
Encoder 3
RP22
6-pin
Encoder 4
RP24
6-pin
Termination Resistors
The ACC-24E2A provides sockets for termination resistors on differential input pairs coming into the
board. As shipped, there are no resistor packs in these sockets. If these signals are brought long distances
into the ACC-24E2A board and ringing at signal transitions is a problem, SIP resistor packs may be
mounted in these sockets to reduce or eliminate the ringing.
All termination resistor packs have independent resistors (no common connection) with each resistor
using two adjacent pins.
Channel Specific Resistor Packs
Channel 1 Channel 2
SIP
Description
RP22 RP24
2.2K
Ω
Reverse resistor pack for encoder loss feature (for differential
encoders only)
RP23 RP25
220
Ω
Termination resistor to reduce ringing (not installed by default).
RP45 RP46
1K
Ω
Install for 5V limits
UBUS Specific Resistor Packs
Resistor Pack
SIP
Description
RP5
220
Ω
Terminator (not installed, only used for non-UBUS)
RP6
2.2K
Ω
Pull Down for Old MACRO CPU
Pull Up for UMAC Turbo & MACRO
ACC-24E2 Limit and Flag Wiring
The ACC-24E2 allows the use of sinking or sourcing position limits and flags to the controller. The opto-
isolator IC used is a PS2705-4NEC-ND quad photo-transistor output type. This IC allows the current to
flow from return to flag (sinking) or from flag to return (sourcing).
A sample of the positive limit circuit is shown below. The 4.7K resistor packs used will allow 12-24V
flag inputs. If 0-5V flags are used, then a 1K
Ω
resistor pack (RP) can be placed in either RP45 or RP46
(refer to the Resistor Pack Configuration section of this manual). If these resistor packs are not added, all
flags (
±
Limits, Home, User, and amplifier fault) will be referenced from 0-5V.
Hardware Setup
7